Mass

In this section we will look at some instruments for measuring mass.

A kilogram is the base unit of mass in the International System of Units (SI). It is very nearly equal to the mass of 1,000 cubic cm of water. Since 2019, it is defined by setting the fixed numerical value of Planck's constant to 6.62607015 x 10–34 joule seconds. It is also a unit of force or weight equal to the weight of a kilogram mass under a gravitational attraction equal to that of the earth. Abbreviation: kg.

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