| Weight, mass, volume and density
The term weight means how heavy things are, and grams or kilograms are used as units of weight. But in physics and in engineering, grams and kilograms are units of mass. Whether an object is on earth -where it is subjected to gravity - or floating weightless in space, its mass is always the same.
The mass of an object is the object's volume multiplied by its density.
The weight of an object is the force exerted on the object's mass by gravity.
The volume of the object, measured in cubic metres (m3 ) -as an object's volume increases, its mass increases
The density of the object, measured in kilograms per cubic metre (kg/m3 )- as density increases, mass per unit of volume increases.
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