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Unit and Dimension are fundamental concepts in physics. Units are standard quantities used to measure physical quantities, such as meters for length, seconds for time, and kilograms for mass. The International System of Units (SI) is the most widely used system, with seven base units: meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd). Dimensions refer to the physical nature of a quantity, expressed in terms of base units. For example, velocity has dimensions of [M^0 L^1 T^-1]. Dimensional analysis helps in converting units and checking the consistency of equations.
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class 11th physics notes