Question

why we use brackets when we write dimensions of any physical quantity?
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Answer 1

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Physicists often use square brackets around the symbol for a physical quantity to represent the dimensions of that quantity. For example, if r is the radius of a cylinder and h is its height, then we write [r]=L and [h]=L to indicate the dimensions of the radius and height are both those of length, or L.

Answer 2

Answer:

Physicists often use square brackets around the symbol for a physical quantity to represent the dimensions of that quantity. For example, if r is the radius of a cylinder and h is its height, then we write [r]=L and [h]=L to indicate the dimensions of the radius and height are both those of length, or L.