What is the best description of mass?
a. how many protons and neutrons an object is made from
b. how much an object weighs
c. how much the protons and neutrons in an object weigh
d. how much the atoms in an object weigh
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Mass is the amount of matter an object contains, and is usually measured in grams or kilograms. The term "mass" is used almost interchangeably with the term "weight", so there is a lot of gray area here. Weight is the force that is generated as a result of the Earth pulling on the mass in an object. Weight is measured in Newtons, while mass is measured in grams or kilograms. But in a lot of science questions, The term mass is used in conjuction with weight. To further confuse the issue, some of these problems will actually say "A certain object weighs 75 kilograms...". So you have a very loaded question here. I would tend to pick "A", which would be closer in line with what I told you originally, that mass is a measure of the amount of matter in an object. But if we are going to identify mass with the term weight, "C" would probably work better, as it combines the two terms, mass and weight. It could possibly be "D", although that answer is a little too general for what we are looking for.
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