The mass of an object is sometimes called the "amount of matter". Please note that this is an informal description, not a very precise definition.
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Well the amount of area in your body is known as volume but density (how mant atoms per cm2) is mass times volume.
All three are measures of mass which is the amount of matter contained in a body. They differ in their scale.
Body Mass Index or BMI
put it in a glass baker filled with amount of water enough to cover the body measure the amount of the water before and after you put the body the difference is the volume of the body
A sphere