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POPULAR SCIENTIFIC UNITS

PUBLISHED BY: SURENDER KUMAR
OCTOBER 25, 2012

   
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 POPULAR SCIENTIFIC UNITS

IMPORTANT SCIENTIFIC UNITS

 

ACRE  

 

An area of 43,000 square feet. Originally, the area ploughed by a yoke of oxen in one day.

 

 

ASTRONOMICAL UNIT (A.U.)

 

A distance of 93,000,000 miles, the average distance of the earth from the sun. Used in astronomy.

 

 

BTU

 

British Thermal Unit. The amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit (252 calories).

 

DECIBEL

 

The unit of relative loudness of sound. A decibel is the smallest amount of change detectable by the our ears.

 

 

HERTZ

 

Unit for measurement of wave frequency (equivalent to “cycles per second”).

 

 

HORSE POWER

 

The power necessary to lift 33,000 pounds by a distance of one foot in one minute. Equal to 746 Watt.

 

 

KARAT(Kt.)

 

A measure of the purity of gold, signifying how many parts out of 24 parts are pure gold. For example, 18 karat gold is ¾ pure. Also spelt Carat.

 

 

KNOT

 

The unit of the speed of a ship.

 

 

LIGHT YEAR

 

A Light Year represents 5,880,000,000,000 miles, the distance light travels in a year at the rate of 300000 Kilometre per second. Frequently used to describe interstellar space and astronomical distances.

 

 

PARSEC

 

Approximately 3.26 Light Year or 19.2 trillion miles. The term combines the first syllables of parallax and second, and the distance is that of the imaginary star when the lines drawn from it to both the earth and the sun form a maximum angle or parallax of one second (1/360 degrees). Used for measuring interstellar distances.

 

 

ROENTGEN

 

The unit of radiation exposure. Curie and Rutherford are also the units of measuring radioactivity.

 

 

WATT

 

A unit of power. The power used by a current of one ampere across a potential difference of one volt equals one watt.

 



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