Class 11 Physics Units and Measurements Measurement of Mass

Measurement of Mass

Mass is usually measured in terms of kg but for atoms and molecules, unified atomic mass unit (u) is used.

1 u = 1/12 of the mass of an atom of carbon-12 isotope including mass of electrons (1.66 x 10-27 kg)

Apart from using balances for normal weights, mass of planets is measured using gravitational methods and mass of atomic particles are measured using mass spectrograph (radius of trajectory is proportional to mass of charged particle moving in uniform electric and magnetic field).

Range of Mass

Object

Mass (kg)

Electron

10-30

Proton

10-27

Red Blood Cell

10-13

Dust particle

10-9

Rain drop

10-6

Mosquito

10-5

Grapes

10-3

Human

102

Automobile

103

Boeing 747 aircraft

108

Moon

1023

Earth

1025

Sun

1030

Milky way Galaxy

1041

Observable Universe

1055

 

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