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MASS, WEIGHT, DENSITY

PUBLISHED BY: SURENDER KUMAR
OCTOBER 25, 2012

   
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MASS, WEIGHT, DENSITY

MASS

It is the quantity of matter in a body. It is measured in Kilogram or Grams.

 

 

 

WEIGHT

Is the downward force acting on a body due to the attraction of the earth. It is measured in Newtons or Dynes (the same units as force).

 

 

 

MASS AND WEIGHT

An ordinary pair of scales helps us to compare masses and not the weights, for both the substances in the pans are equally affected by gravity - the force with which the earth attracts bodies. In case of spring balance we measure the weight, for an increase in the length of the spring depends upon the force pulling it down. Note that the weight of a body differs at different places on the earth, on account of the variation in gravity, but its mass remains the same. Similarly, a body will have the same mass on the Moon as on Earth whereas its weight on the Moon will be a sixth of its weight on Earth.

 

Mass is measured in kilograms, grams or pounds, whereas weight is measured in Newtons or Dynes (I Newton = 107 Dynes).  Mass can also  be measured in pounds.

 

Internationally, it is measured in terms of a kilogram.

 

1000 grams = 1 kilogram.                                 

 

1 milligram =  of a gram.

 

1 kilogram = 2.2 lbs. Approx.                            


1 litre of water weighs 1 kgm.

 

1 pound weigh 453.6 gms.                    

 

1 cubic centimeter of water weighs 1 gram.

 

 

 

DENSITY

The mass contained in a unit volume of a body is called its density. It can be expressed in terms of Kg/Litre or  Gm/Cubic Centimeter. A substance having more density will obviously occupy lesser space as compared to another having lesser density. For instance, you may be able to store 1 Kg. gold in a small container, but you may find it difficult to contain cotton in it because gold has more density than as cotton.

 

 

SPECIFIC GRAVITY

The ratio of the mass of a given volume of the substance to the mass of an equal volume of water.



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