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How much stuff do you have? That is the question! Although I'm not sure what you mean by "classified" -- is there a classification system for quantity? -- I do know there are several units of measure that deal with quantity. All matter has mass and occupies space. The unit of mass in the SI (metric) system is the kilogram. The more kilograms of something you have, the more of it you have. That's pretty obvious. And it works for different substances. Let's say you have a 10-kg chunk of aluminum and a 5-kg chunk of iron. The aluminum chunk contains more matter than the iron chunk. Related to mass is an attribute called weight. The mass of an object doesn't change regardless of its place in the universe, whereas the weight of an object changes depending upon where it is. Nevertheless, weight is a useful parameter here on the surface of the Earth, because if we know an object's weight, we can determine its mass. People frequently mix those two things up. (In fact, mixing them up is nearly unavoidable in the American and Imperial systems of units because of the confusion between the pound-force and the pound-mass, but that's another story.) We can also measure quantity in terms of the space an object occupies. A gallon of water occupies more space than an ounce of water. A cubic yard of dirt occupies more space than a flowerpot full of it. So, in summary, if we wish to know how much stuff we have, we can weigh it, to determine its mass and how much matter is present, or we can measure its volume, to determine how much space it occupies.

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18y ago

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