PHYSICAL QUANTITIES AND THEIR UNITS

LET’S START THE – PHYSICAL QUANTITIES AND THEIR UNITS

INTRODUCTION 

Length -meter

Time – second 

Volume – cubic metre (m³)

Velocity -metre/second 

Angular velocity -rad/sec

Acceleration -metre/sec²

Force -Newton

Pressure -Pascal

Temperature -Kelvin 

Mass-kilogram 

Density -kg/m³

Heat-Joule

Energy -Joule

Electric current -ampere

Area-square metre 

Specific heat capacity -J0ule/kg.k

Electric power -kilowatt-hour (kwh)

Electric resistance -Ohm 

Electric potential- volt 

Latent heat -Joule/k

Surface tension -Newton/metre 

Moment of inertia -Kgm²

Electric capacity -faraday

Power -Joule /second  or watt

Viscosity -Newton -sec  .metre^-2

Work-Newton-metre 0r  joule 

Luminous intensity -Luman 

Luminous intensity -Candela 

Frequency -Hertz 

Wavelength-metre 

Speed -metre/sec

Plane angle -radian

Intensity (in sound )-decibel

Absolute temperature  -kelvin 

Potential difference -volt

Electric field / intensity -Newton/coulomb

Magnetic field /induction -Tesla ,  Weber/metre²

Magnetic dipole/movement -Ampere-metre 

Magnetic flux-Weber, or Maxwell

Linear momentum – Newton sec

Power of the Lens – Diopter 

Solid angle -Steradian 

Atmosphere pressure – bar 

Astronomical distance -light year 

Supersonic motion -Mach 

Acceleration due to gravity -metre/sec²

Amount of substance – mole 

Young modulus elasticity  -Newton /metre²

Entropy – Joule/kelvin

Parsec is the unit of distance 

Shortest unit of length is Nanometer

Light-year is the unit of distance 

Absorbed dose – gray 

Absorbed dose – rad 

1 Gray- 1 joule/kg

1 Gray-100 rad

Exposure-c/kg

Activity -Becquerel (Bq) of

1 Curie-  3.7×10¹⁰Bq

1Bq-  2.7×10^-11ci

1 Roentgen- 2.5×10^-4 coulomb/kg

Other facts –The visible range of solar radiation is -400-700 Nm

The nature of light radiation is wave and particle both (dual )

Electromagnetic radiation -X-ray & Gama ray 

The ratio of the velocity of X-ray and Gama-ray is -1

The frequency of sound waves in the audible (hearing) range is  20 Hz to 20,000 Hz (20 kHz)

The ultrasonic waves used in diagnostic imaging frequency range is 1 MHz – 20 MHz 

Ultrasonic waves frequency – more than 20,000 Hz

Infrasonic waves frequency -less than 20 Hz

Navigators used frequency -SONAR

Maximum speed of sound occur in  steel 

The power of sunglasses is (zero) 0 Diopter 

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