What is Mass according to the provided material?

• A. A measure of the amount of matter in an object. Density times volume.
• B. The amount of space an object occupies.
• C. The mass divided by gravity.
• D. A property that describes temperature change.

Answer: (A)

Mass is the amount of matter in an object, and it can be found by multiplying density by volume. That works because density tells us how much mass there is per unit of volume, so scaling by the object's volume gives the total mass. For example, with a density of 2 g/cm^3 and a volume of 3 cm^3, the mass is 6 g. The other ideas mix up different quantities: volume is the space an object occupies; dividing mass by gravity isn’t a standard measure of mass; and a property describing temperature change relates to heat, not how much matter there is.