The methods of measurements are classified into two categories-
a) Direct methods and
b) Indirect methods.
Direct methods: In these methods, the unknown quantity is directly compared against a standard. The result is expressed as a numerical number and a unit. Direct methods are quite common for the measurement of physical quantities like length, mass and time.
Indirect methods: These methods are apply in which measurement by direct method are not possible, flexible and practicable. This method includes always error in measurement.
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