Question

Explain the methods to measure mass.​

Answer 1

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Mass is an intrinsic property of matter. Its SI unit, the kilogram, is now defined by taking the exact numerical value of the Planck constant when its l value is expressed in the appropriate SI unit, together with the definitions of the metre and the second.

Direct measurement of mass involves comparison with multiples and submultiples of the kilogram using a beam balance. Masses of planets and stars are found indirectly by measuring the period of revolution of their satellites and applying Newton's law of gravitation. Masses of atomic and subatomic particles are found indirectly using mass spectrometer, in which the radius of the circular path of a charged particle of a given velocity in a uniform magnetic field is proportional to the mass of the particle. In dealing with atomic, molecular and nuclear masses, we use a non-SI unit called the unified atomic mass unit. .

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