What is dimensions of physical quantity?

Dimensions of a physical quantity refer to the fundamental units of measurement that are used to express that quantity. These dimensions are typically represented by square brackets, such as [M] for mass, [L] for length, and [T] for time. The dimensions of a physical quantity are important because they help in understanding the relationships between different quantities and in performing calculations involving those quantities.

Physical quantity is a quantity that can be measured. It has magnitude and direction. Dimensions of physical quantity are the powers to which the base quantities are raised in order to express the given physical quantity.