Although mass and weight are often mistaken to have the same meaning, mass and weight are different quantities.
Mass is a measure of the amount of matter in an object.
Weight is the force that gravity exerts on an object.
Mass does not depend on the location of the object, but weight does.
The mass of an apple is constant on earth or moon.
On the other hand, the weight is dependent on the location.
The weight of an apple (the force that pulls the apple) differs from a place to another.
The apple would weight only one-sixth on the moon than it does on earth because the gravity of the moon is one-sixth that of the earth.
You can measure the mass of any substance using a balance (the process of measuring mass is called weighing!!). The unit of mass is the kilogram or gram. The balance you use at home measures the mass.
The weight can be measured using a spring scale, and the unit of weight is Newton (kg m/s2)
Weight (W) = mass X gravitational acceleration (g=9.8m/s2).
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