# Question Video: Defining What Is Meant by a Physical Quantity Science

Which of the following best states what a physical quantity is? [A] A physical quantity is a measurement of something. [B] A physical quantity is something that can be measured.

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### Video Transcript

Which of the following best states what a physical quantity is? (A) A physical quantity is a measurement of something. (B) A physical quantity is something that can be measured.

These two answer options may seem to be saying the same thing. They are different, though. Say that we have some physical object like this. This object has various properties like mass or speed or height. And say that we were to measure these particular quantities. Our results might be as follows. And now notice that we have two columns. The first column shows the thing that is being measured, and the second column shows the measurement of that thing. Answer option (A) is talking about the measurement itself. That would be our second column. Answer choice (A) is saying, for example, that 8.1 kilograms is itself a physical quantity, so as zero meters per second, and so on.

Option (B), on the other hand, is talking about the other column, mass and speed and height in general. This is the best definition of a physical quantity. Rather than being the measurement of something itself, a physical quantity is something that can be measured.