They produce magnetic fields that are quite. Which of the following properties is used to distinguish between the core, mantle, and crust of a planet? the rigid rocky material of the crust and uppermost portion of the mantle. The world’s most powerful magnet was built in the United States in 2011 in a University Center in Florida. And when it comes to magnets, opposite poles (N and S) attract while other poles (N and N, S and S) repel. It is equally strong at the north pole compared with the south pole. Many common materials such as water, wood, plants, animals, diamonds, fingers, etc. Magnetic field lines. A magnet is any material or object capable of producing its. Neodymium – The World’s Strongest Magnet. Every year, more than a thousand scientists from dozens of countries come to use our unique magnets with the support of highly experienced staff scientists and technicians. Nickel is magnetic, and when present in large enough quantities, can make bronze slightly magnetic. It's a bit thicker and heavier, but the kickstand is sturdier and way more flexible; you can adjust the viewing angle up to 180 degrees and it easily. The entire magnet. The magnetic force of the. The 2022 Queen Elizabeth Prize for Engineering is awarded to Dr Masato Sagawa for the discovery, development and global commercialisation of the world’s most powerful permanent magnet, which has been transformational in its contribution towards enabling cleaner, energy saving technologies. Anything that is magnetic, like a bar magnet or a loop of electric. They have an elaborate manufacturing process of vacuum melting, milling, pressing and sintering. 22 Tesla (T), which is more. The world’s strongest magnets in a billionth of the time. g. As a leading magnet supplier across the world, Stanford Magnets. Tool Materials as Handles Material Durability Modifier Traits Electrical Steel 80 0. Its magnetic susceptibility is small and negative, which ranges from +10-5 to +10-3. The permanent magnet is especiallyThe MagLab is the largest and highest-powered magnet laboratory in the world and is the only facility of its kind in the United States. Strength: 45 tesla: Type: Hybrid: Bore size: 32 mm (~1. It is a kind of magnet made by mixing samarium, cobalt, and other metals to form an alloy, and then the alloy is crushed, pressed, and sintered. Materials classified as ferromagnets are ones that exhibit the strongest magnetic properties. g. Answer: A magnet is a material or object that can produce magnetic force. ) As a general rule, stainless deserves consideration if your engineering project requires at least one of these three qualities: A shiny, beautiful appearanceStudy with Quizlet and memorize flashcards containing terms like Which electromagnet is the strongest?, Fill in the word that completes the statement. In addition, there are other variations such as Electromagnets, Flexible magnets and Bonded magnets. Neutron star X-ray binaries are systems consisting of a neutron star and a normal stellar companion. A magnet grade is a good measure of the strength of a magnet. This is the best neodymium magnet for fishing which can hold the stand of 5000 lb (weight) to perform a heavy-duty fishing magnet. However, bronze is generally not magnetic. The different types of magnetism refer to the way a material reacts to an external magnetic field. Permanent. The magnetic pole is the region where the external magnetic field is the strongest at each end of a magnet. B. 9 UnnaturalMagnetic anisotropy means that the magnetic properties depend on the direction in which they are measured. Magnetic fields such as that of Earth cause magnetic compass needles and other permanent magnets to line up in the direction of the field. A magnetic field is produced by moving electric charges and intrinsic magnetic moments of elementary particles associated with a fundamental quantum property known as spin. Other than water, materials with the strongest diamagnetic force are carbon graphite, bismuth and silver. This magnetic field is caused by ferromagnetism and is the strongest form of magnetism. 1 Materials. (HFIPS, CAS) claims new world record for strongest steady magnetic field of 45. Magnetic particle testing is a nondestructive testing method for detecting discontinuities in magnetizable material. The rules of magnetism Two magnets will either attract or repel each other. If you were to sprinkle iron filings on a piece of paper and place the magnet beneath it, you could. It is the process in which warm material expands and rises while cool material contracts and falls. The magnetic field of each magnet is due to microscopic currents of electrically charged electrons orbiting nuclei and the intrinsic magnetism of fundamental particles (such as electrons) that make. Sometimes these motions are microscopic and inside of a material known as magnets. Ferrimagnetism. $4. Magnets are objects that produce magnetic fields and attract metals like iron, nickel and cobalt. A group of materials made from the alloys of the rare earth elements are also used as strong and. If you had a fixed volume (x millimetres cubed) of neodymium magnet 'material' of the equivalent strength of magnetism, what shape would produce the strongest poles. The magnetizing effect is stronger if you heat the rod. Current is the movement of electrons, and electrons are what make materials magnetic. Each atom has electrons, particles that carry electric charges. Samarium Cobalt is the next strongest magnetic material, followed by ferrite and Alnico. CMEs originate from highly twisted magnetic field structures, or “flux ropes”, on the Sun, often visualized by their. as other MagneticBEST OVERALL: CREMAX Magnetic Screwdriver Set 57 PCS. Source: DOE/Lawrence Berkeley National Laboratory. The magnetic properties of the various grades of neodymium magnets are adjusted by using varying amounts of rare earth elements in the alloy mixture, with each element adjusting the characteristics of the material in a different way. Magnetism is the force exerted by magnets when they attract or repel each other. It is the basic force responsible for such effects as the action of electric motors and the attraction of magnets for iron. The researchers were able to generate a magnetic field of 1,200 teslas. When a magnetic field gets stronger than about 500,000 Gauss, objects get ripped to pieces by the intense forces. SmCo Magnet. Zone 4, the area containing the MRI scanner that is associated with the strongest magnetic field, should be. Other common materials such as SmCo, AlNiCo, and Ferrite magnets are also listed as these. The Insight-HXMT team has recently discovered a cyclotron absorption line with an energy of 146 keV in the neutron star X-ray binary Swift J0243. If you are currently using. In fact, we can't make magnetic fields stronger than a million gauss or so without our machines just breaking down. They form closed loops that continue all the way through a magnetic material. iron filings) and attract or repel any other magnet. Far from its daily use we can find great magnets with scientific purpose. The neutron star accretes. The magnet is a steel in which the domains. However, certain materials can be magnetised or demagnetised according to the requirements. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials and attracts or repels other magnets. The arrangement of electrons within an atom is called the: electron configuration. the ability to retain the magnetic field. To do this they set up a comparative test. Terbium. The added power (with reduced bulk) could help enable. Graphene, one of the world's strongest materials, isn't normally magnetic. For example, the poles of the bar magnet shown in. Magnetism can be described as a force that attracts and repels magnetic objects. Apply the Magnetic Paint. Magnetic materials are defined by their response to an external field (in other words, their permeability). midway between each side of the magnet. a 2 mm thick coiled wire with two loops. The magnetic close magnetic Able to be magnetised or attracted to a magnet. Two objects containing charge with the same direction of motion have a magnetic attraction force between them. In fact, it holds the title of the strongest permanent magnet globally. Magnetic materials with a high frequency are made of rare earth elements such as nickel and manganese. You’ll find magnets that are both round, slightly larger than a penny, and rectangular, measuring more than 2 inches long. Conclusion. made from one of the strongest magnetic materials commercially available will measure a maximum of 6,250 Gauss on the magnet’s surface and considerably less as. After direct measurement of the strongest magnetic field in the universe at about 1 billion Tesla in 2020, the world. In the mid-1980 s neodymium (also called rare earth) magnets started to become available. Barium ferrite, essentially BaO:6Fe 2 O 3, is a variation of the basic magnetic iron-oxide magnetite but has a hexagonal crystalline form. Maglastic offers bonded neodymium magnets, which can be magnetized in the axial, radial, multi-poles, or local direction. Neodymium magnets are the most powerful sort of permanent magnet available to users. A neodymium-iron-boron magnet is the strongest magnet in the world, with a strength of up to 34 tons. 3 Tesla. To clarify the power of the world's strongest magnet, a strong refrigerator magnet is 100 gauss. This magnet is used in scientific research, such as in the study of superconductivity and materials science. A magnet is an object that attracts certain materials such as iron. But some substances are strongly magnetic, which means most of their electrons spin in the same direction. The poles are regions where the magnet is strongest. Diamagnetism is the property of materials that are repelled by a magnetic field; an applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force. There are various kinds of magnetism, out of which ferromagnetism is the strongest type. Electrons in orbitals that experience shielding are less. We will focus specifically on the strongest rare earth magnets available, neodymium magnets (NdFeB) and samarium cobalt (SmCo) magnets. While copper is an excellent conductor, it isn’t magnetic. This project aims to replicate the fusion process on a large scale. Hard-magnetic materials require high magnetic fields to reach saturation. The magnet is as powerful as a previous structure 40 times its size. Ferromagnetism is the strongest type and is responsible for this common phenomenon. The image is a cut through the orbital. 22 Tesla. The main distinction is that in some materials there is no collective interaction of atomic magnetic moments, whereas in other materials there is a very strong interaction. First a femm model of pair of N40 neodymium magnet poles in air for a. For example, the poles of the bar magnet shown in Figure 20. 19). The strongest magnet in the world is currently a man made pulse magnet, which is a type of electromagnet, at the University of Tokyo. A new high-temperature superconducting magnet has reached 20 teslas. Permanent magnets are controlled by the material’s structure. A magnetic north pole will attract the south pole of another magnet, and repel a north pole. magnetic materials. Breakthrough in superconducting materials opens new path to fusion. Home Technical Advice For Every Application | Magnet Expert Materials Information Magnetic Materials Information There are five main types of permanent magnet material; these are, in order of strength from strongest to weakest, neodymium, samarium cobalt, alnico, ferrite, and flexible rubber. If you place an object in a magnetic field, it will be affected, and the effect will happen along field lines. The strongest commercially produced magnet known to man is the neodymium magnet. Magnetism can even be caused by electrical currents. A bar magnet suspended in Earth’s magnetic field orients itself in a north–south direction. For nearly two decades, MagLab has had the world's strongest continuous magnetic field at 45 Teslas. Repeat the procedure for all your magnets and compare. As for the hardness scale, titanium is 36 Rockwell C, while diamond is 98. Figure 22. The application is critical in the specification process. 9 T at 10 K. That is part of the lanthanide series on the. Which of the terrestrial worlds has the strongest magnetic field? Earth. A rare earth magnet is a magnet made from one of the rare earth elements (of which there are 17) in the Lanthanide series of metals in the periodic table. ) Jupiter does not have a molten metal core; instead, its. Electric forces exist among stationary electric charges; both electric and magnetic forces exist among. In summary, neodymium bar and block magnets are exceptional due to their unparalleled magnetic strength and adaptability. 7 Gs, which was the third strongest field of all that we tested. The second strongest magnet in the world is the Neodymium magnet. These tangled magnetic fields give rise to sunspots and solar activity such as solar flares and Coronal Mass Ejections (CMEs). 11) Which of the following best describes convection? A) It is the process by which rocks sink in water. It is equally strong at the north pole when compared with the south pole. When the current is shut off, the magnetic field disappears. It includes 23 standard screwdrivers, 60 screwdriver bits, seven precision screwdrivers, 14 socket heads, 16 Allen wrenches, and one ratchet handle. You can demonstrate the science of magnets at home, by producing and testing the strength of a magnetic field. The deal comes despite GM's 2021 agreement to buy rare-earth magnets from MP Materials . At present, the most commercially available magnet, known as the magnet king, has very high magnetic properties and its maximum magnetic energy. SmCo magnet is another kind of rare. A. This material can be anything like iron,etc. Materials like plastics, glass, and rubber are not attracted to a magnet and are non-magnetic materials. A material with a wide hysteresis line, high coercivity, and high remanent magnetism, which remains constant once magnetized. Neodymium magnets contain their namesake rare earth element. What are the types of Ferromagnetic materials? There are two types of Ferromagnetic Materials:But in certain materials, called ferromagnets, all the spins and the orbits of the electrons will line up, causing the materials to become magnetic. Neodymium magnets are considered part of the family of rare earth magnets because their main element is the rare earth element, neodymium. The rules of magnetism Two magnets will either attract or repel each other. Over time, the Sun’s differential rotation rates cause its magnetic field to become twisted and tangled. BEST FOR MECHANICS: Gearwrench 20-Piece Dual-Material Screwdriver Set. the length of time required to demagnetize it. The powdered material can be magnetically aligned and then compacted and sintered. C) It is the process in which warm material gets even warmer and cool material gets even cooler. The force that a magnet exerts is called magnetic force. I will also cover the other two types: ferrimagnetic and antiferromagnetic. That way, the magnetic paint should go further, and you might not need to apply so many coats. BEST FOR ELECTRICIANS: Hurricane 13-Piece 1000V Insulated. The term itself usually refers to the magnetic dipole moment. 1), aluminum (2. The permeability of a material describes: a the ease with which it can be magnetized. The most common metals used for permanent magnets are iron, nickel, cobalt and some alloys of rare earth metals. Any material could be magnetized and any material gas his magnetic saturation behind which it is not possible to increase the magnetic field. a 1 mm thick coiled wire with ten loops. There are a variety of effects that can be called magnetoresistance. Magnetic dipoles in these materials are arranged into domains where the arrangements of individual magnetic dipoles are essentially perfect that can produce strong. The Benchcraft Mag Blok had a respectable 1882. Properties. Where is the magnetic force of a bar magnet the strongest? in the center of the magnet. The strongest magnetic field ever produced in labs on Earth = 450,000 Gauss. Unless the. RUNNER-UP: Magzo Screen Door Magnets Fiberglass Door Mesh. Neodymium magnets produce the highest MGOe of any permanent magnet material. The gasses N 2 and H 2 are weakly Diamagnetic with susceptibilities of -0. C. Reason: Add subpages for new materials. Many neodymium magnets can be used up to 80 degrees. It refers to the maximum magnetic energy that the material can be stored. Thanks to funding from the National. The term “rare earth” can be misleading, because. Magnetic tape is an amazing product that acts as a flexible roll of tape but is actually a magnetic material that holds nicely to metals. MADE WITH RARE EARTH neodymium, the strongest permanent magnetic material available. Magnetic field produced by a solenoid (coil of wire). As the name suggests, magnets made of different rare earth elements. Ferromagnetism is a property of certain materials (such as iron) that results in a significant, observable magnetic permeability, and in many cases, a significant magnetic coercivity, allowing the material to form a permanent magnet. The magnetic close magnetic Able to be magnetised or attracted to a magnet. A neodymium magnet can be used in a variety of environments because it can be found in a variety of sizes, shapes, and grades. 2. 6+6124, corresponding to a surface magnetic field. No matter how small a magnet is, it has two poles. Bronze, an alloy of copper, tin, and occasionally trace amounts of nickel. In comparison, the lowest magnetic field was the NorPro Aluminum Magnetic Knife Bar, with only 642. Neodymium magnets (also known as “NdFeB”, “Neo” or “NIB” magnets), are strong permanent magnets made from an alloy of neodymium, iron & boron. 5. While you might think of metal magnets such as the ones you use in class, there. We can produce custom magnets that withstand high temperatures. density. It is black or brownish-black and every shiny when polished. Electromagnets are an important part of many electronic devices, like motors, loudspeakers, and hard drives. There are several material choices including Neodymium Magnets (NdFeB or Rare Earth ), Alnico Magnets, Samarium Cobalt (SmCo )or Ferrite Magnets (Ceramic). Like all types of steel, this alloy is highly impact resistant and scores mid-range on the Mohs scale. Thank you for reading our article and we hope it can help you to have a better understanding of the neodymium magnet – the most powerful magnet in the world. 2. , A bar magnet is a permanent magnet, while an electromagnet is a temporary magnet: Why is. What Is The 2 Strongest Magnet? Neodymium magnets are the second strongest magnets in the world. These types lack a permanent magnetic field, so they. Pieces of lodestone were actually used in the very first magnetic compasses ever made. Furthermore, with ferromagnetic materials, all of the electrons’ spins and orbits align, causing the materials to become magnetic. 4) and magnesium (1. Crystal structure of α”-Fe 16 N 2. Spread the love. 5, for the first time, a large high-temperature superconducting electromagnet was ramped up to a. The field is generally strongest in a dark area (umbra), but sometimes stronger fields are found in non-dark regions, such as a penumbra and a light bridge. (Actually, there are a few hundred. The plastic retains the flexible quality of the sheet. Compass (f) Magnetisation: 7. The bar or nail should retain some of its magnetism even after the electrical current has. 2. A temporary magnet, or. 2. So far I've been examining arrays where one side is used, similar to the one for your production line. In particular, Strnat and Ray developed the first. Materials serve the purpose of changing a block's appearance, weight, and friction. In the United States a new program in applying HTS conductors to accelerator magnets requires R&D to accommodate the complexity of working with this new material. MFR Test Condition: NB/HNB series (270℃, 10kg); NC series (310℃, 10kg). Diamagnetic materials repel magnets at the point of their greatest magnetic field. 1 pt. This maximizes the permeance of the core. Neodymium magnets come with an incredible magnetic field. Call it another victory for German design. Ferromagnetism is the property of certain materials that enables them to form magnets and be attracted to magnets. Not all materials are attracted by the magnet. There is usually an adhesive on one side that allows you to stick the. N42 grade offers a high performance at. Its magnetic force of it is the strongest at the poles. Read more about these two types of magnets. Coating: ni+Cu+Ni 3 Layer Plated. The Phifer 18/14 screen is our standard material we use for our screen enclosures. They are used in applications where the strongest magnetic force is required from the smallest possible volume of material. There are several material choices including Neodymium Magnets (NdFeB or Rare Earth ), Alnico Magnets, Samarium Cobalt (SmCo )or Ferrite Magnets (Ceramic). materials that can be magnetized by an external magnetic field and remain magnetized after the external field is removed). Which Is The Strongest Magnet? The strongest type of permanent magnet available commercially are neodymium (Nd) magnets. 5. Figure (PageIndex{1}): Ferromagnetism (a) nonmagnatized material and (2) Magnetized material with corresponding magnetic fields shown. The strongest commercially produced magnet known to man is the neodymium magnet. Using the strongest materials known to man, scientists are building the most powerful electromagnet in the world — one that won't blow up a split second after it's turned on. This force is mediated by magnetic fields that penetrate different media. You must have seen the various types and shapes of magnets in various applications such as speakers, electric motors, actuators, and even in toys. RUNNER-UP: CRAFTSMAN Ratcheting Screwdriver Set, 26-Piece. To bridge the gap between performance and durability MPI has developed the new Hi-G Magnetic Tube. In comparison, the previous record for a single-molecule magnet was 7. Material Stats are given to individual tool parts based on their material. The strongest permanent magnets are known as neodymium magnets and are made from an alloy of neodymium, iron and boron. red and blue. BEST BANG FOR THE BUCK: Homearda Magnetic Screen Door. According to the team's abstract describing its new magnet, these older supermagnets. Jupiter. ; Magnetic. The magnetic moments of its electrons all point in the. Magnetic Grading: Neodymium magnets come in different grades, such as N35, N42, N52, and more. Multiple Choice. Although titanium has gained a reputation of being an extremely strong material, most steels are stronger. Magnetic field lines bunch together where the magnetic field is strongest. Using the strongest materials known to man, scientists are building the most powerful electromagnet in the world — one that won’t blow up a split second after it’s turned on. 8 percent pure, and the relative permeability of soft iron with 99. This super magnet has a magnetic field of 44. Researchers theorize origins of magnetars, the strongest magnets in the universe. Neodymium. Here I would like to mention an experiment done. D. Amazon. magnetic pole, region at each end of a magnet where the external magnetic field is strongest. not capable of being magnetized. To do this they set up a comparative test. 18 for 10 to 99 items and save 20%. In general, higher numbers indicate a stronger magnet. a magnet made from a ferromagnetic material that loses its magnetism quickly. What is the strongest magnetic material? _____- 6. These permanent magnets make some of the most durable ones in the market. They were developed in the 1970s and 1980s and are the strongest types of permanent magnets. Yes. : ch13 : 278 A permanent magnet's magnetic field pulls on ferromagnetic materials such as. Making a Magnet. Remanence, measured in Gauss, is the magnetism left in the magnet after removing the external magnetic field. Determine the level of difficulty. Sunspots are the most notable structure on the solar surface with strong magnetic fields. Uses An MRI machine that uses a. Ferromagnetic materials are strongly attracted to both poles of magnets. The two most common rare earth magnets are Neodymium (Nd. Only 10 of these unusual objects have been discovered. So far, it is the strongest permanent magnet. 83. Sound is really just the movement of air. Magnetic field lines are strongest around the middle of the magnet. method can. If you want to generate the largest magnetic field with the lowest electrical power for a given core material and conductor material: Build a closed ring out of the magnet material e. A simple electromagnet consisting of a coil of wire wrapped around an iron core. They're produced from rare earth minerals, which are among the world's most powerful things. This handy and useful neodymium strong cup magnet has a strong magnet. Size (D x. force is strongest near the magnet’s poles. This material is applied as a ribbon-like tape, and it allows them to create a much stronger magnetic field in a much smaller space. double hexagonal close-packed (dhcp) Neodymium is a chemical element; it has symbol Nd and atomic number 60. [2] The magnetic field of 43,000 gauss is the strongest magnetic field ever detected in a star that exceeds the Chandrasekhar mass limit, which is the critical limit above which stars may collapse. It is basically composed of a single layer of carbon atoms arranged in a triangular lattice and it’s the basic structural element in. Diamagnetics. Nickel. The magnet is made from an alloy of iron, cobalt and nickel and is known as the ‘magnetar’. Ferromagnetism is the basic mechanism by which a material form permanent magnet (i. currents. It has a 400 lb magnetic force with high-quality material neodymium. This would be your normal iron, cobalt, nickel. domains. Materials in the last three groups exhibit long-range magnetic order below a certain critical temperature. BEST FOR FRENCH DOORS: Ikstar Magnetic. The atoms of paramagnetic materials have randomly aligned magnetic moments. What these magnets all have in common is that they are hard magnetic materials. These materials are used in devices requiring a stable and strong magnetic field, such as magnetic storage systems. Depending on the grade of the magnet, the heat will demagnetize the magnet. midway between each side of the magnet. Magnetically hard materials are used to create permanent magnets made from alloys generally consisting of varying amounts of iron, aluminium, nickel, cobalt and rare earth elements samarium, dysprosium and neodymium. These magnets are actually made of an alloy of neodymium, iron, and boron. The pole strength of a magnet is defined as the force acting on the material attracted to it. Their magnetic fields—the strongest we've observed—could melt you from 1,000 km away. A neodymium-iron-boron magnet is the strongest magnet in the world, with a strength of up to 34 tons. With sophistication, class and some of the most powerful magnets on the market, (55 to be exact!) this necklace is one of my favorites on the list. Neodymium and samarium—two of the 17 rare earth elements—are ferromagnetic, meaning that they have inherent magnetic properties and can be magnetized. electromagnet. . Ferromagnetic materials are significantly non-linear (see definition in Section 2. Neodymium magnets are also called neodymium iron boron magnets. Record your results. It strongly affects the shape of the M-H curve. Like all types of steel, this alloy is highly impact resistant and scores mid-range on the Mohs scale. Due to their high magnetic strength and relatively low-cost, neodymium magnets are. The strongest magnets are made of rare earth materials, which are some of the most powerful substances in the world. Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material? rod = iron; type of magnetic material = hard. A 2-gram (0. False - The area between the poles of a magnet has the strongest effect. Ferromagnetic Material – Ferromagnetism. 1. Which of the following most likely explains why Venus does NOT have a strong magnetic field? Its rotation is too slow. On August 12, the hybrid magnet of the Steady High Magnetic Field Facility (SHMFF) in Hefei, China, generated the world’s highest steady magnetic field by a working magnet measuring 45. PART # N55P500500. For a magnet to stick to a fridge door, several physical effects inside of it need to work together perfectly. The region around a magnet where a force can be felt is called the magnetic field. Specs. Magnet is a material that produces a magnetic field. strongly attracted by a magnet. [51] The Earth's field originates in its core. When activated, the ferromagnetic materials magnetic field. The Steady High Magnetic Field Facility (SHMFF) in Hefei, China, recorded a field strength of 45. Samarium Cobalt Magnets. NdFeB Magnet. The Earth and most of the planets in the Solar System, as well as the Sun and other stars, all generate magnetic fields through the motion of electrically conducting fluids. Place the bar magnet at the center and mark the position with a pencil. The strongest magnet in the world can lift a weight of approximately 10,000 tons. It seems able to store most energies, particularly magic. Magnets, or the magnetic fields created by. Recently, in an effort to highlight these small but interesting forces, some scientists used an incredibly strong magnetic field (16 Tesla, or 160,000 Gauss) to levitate a frog. 5. 6 22. A student wishes to make a permanent magnet. Magnetism is believed to be caused by the alignment of small, numerous sub-units called _____. These grades indicate their magnetic strength, with higher numbers representing stronger magnets.