Meaning

Question

Hello,Any number that is used to describe a physical phenomenon quantitatively is called a physical quantity.Here , I am not able to understand the meaning of the sentence.The last part "is called a physical quantity" is for  "any number" or for "a physical phenomenon".Could any one here explain it?Thanks.

AlpheccaStars · Accepted Answer

I suppose that the speaker is referring to some of the physical constants in nature.
e.g Avagadro's number, Faraday constant, the charge of an electron, the gravitational constant, etc.

Anonymous · Answer

For example, the number 100, by itself, is a pure number - meaning ten tens, or a hundred ones, or five twenties, etc. - with no physical significance.  However, 100 kilos, is no longer a pure number without physical significance, since the word "kilos" is now attached to it.  "Kilos" is associated the physical phenomenon of mass.  Thus, "100 kilos" represents a quantification of the physical phenomenon of mass, and is thus a physical quantity, rather than a pure number.  Note that if the context is clear, you could say "100", and this would be understood to mean 100 kilos, rather than the pure number 100.

Enoon · Answer

The passive verb is "is called". The subject is "number". "That is used to describe a physical phenomenon quantitatively" is a dependent clause acting as an adjective modifying the subject. "A physical quantity" is the direct object.

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