![]() ![]() Weight, though related to mass, nonetheless differs from the latter. (Until 2019 the kilogram was defined by a platinum-iridium cylinder called the International Prototype Kilogram kept at the International Bureau of Weights and Measures in Sèvres, France.) In the English system of measurement, the unit of mass is the slug, a mass whose weight at sea level is 32.17 pounds. With the second and the metre already defined in terms of other physical constants, the kilogram is determined by accurate measurements of Planck’s constant. ![]() One joule is equal to one kilogram times metre squared per second squared. ![]() The unit of mass in the International System of Units (SI) is the kilogram, which is defined in terms of Planck’s constant, which is defined as equal to 6.62607015 × 10 −34 joule second. The greater the mass of a body, the smaller the change produced by an applied force. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force. Mass, in physics, quantitative measure of inertia, a fundamental property of all matter.
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