Density: the ratio of an object's mass to its volume. (measured as grams per centimetre cubed: g cm-3)
Mass: a measure of a body's resistance to a change in velocity. (measured in kilograms kg).
Matter: is anything that takes up space and has a measurable mass.
Specific gravity: the density of a substance to that of water (weight divided by loss of weight in water).
Weight: the force with which an object of certain mass is attracted by gravity to the Earth or another body. (measured in Newtons : N)
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