The SI unit system provides a standard for measuring all physical quantities, including the seven fundamental quantities.
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Errors in measurements occur due to various reasons, including random and systematic errors. Reducing random errors improves accuracy.
Fundamental quantities are independent and form the base of derived physical quantities. Examples include length, mass, and time.
A dimensionless quantity is independent of the unit system used.
Accuracy refers to how close a measured value is to the true value.