Why physical quantities can be reprented graphically?

or:Why physical quantities can be reprented graphically?or:Well, my first reaction was \"Why? What kind of an answer do you expect to that?\" But it

or:Why physical quantities can be reprented graphically?

or:Well, my first reaction was \"Why? What kind of an answer do you expect to that?\" But it occurs to me that a graph expresses math, and math is only valid when it describes reality, so a graph of physical quantities represents reality in a visible format.

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