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Hi viewers:
Today we will discuss about measurement of Mass and Weights.  These two physical quantities are very important so far measuring other physical quantities are concerned.



1.  Mass of a body is the quantity of matter contained it.

2.  It is a constant quantity and it cannot be zero

3.  It is a scalar quantity, which means it has no direction


4.  The units of mass

In CGS system: gram

In FPS system:  pound

In MKS system:  Kg

Multiple and submultiples of Kg

1000 mg   =  1g

1000 g      =  1Kg

100 Kg     =   1 quintal

10 quintal  =   1 tonne

Therefore, we can say 1000Kg  =  1 tonne

5.  Mass is measured in beam balance, physical balance and electronic balance



What is one gram?

Gram:  It is the unit of mass in the C.G.S. system.  The mass of certain cylindrical piece of platinum-iridium alloy kept in Paris is called a standard kilogram, which is known as the international prototype Kilogram.  One thousandth part of Kg. is a gram.

What is one pound?
It is the standard unit of mass in the F.P.S system.  The mass of a certain piece of platinum kept at the standard department of the Board of Trade in England is taken as a pound and is known as the prototype pound.

What is weight?

1.    The weight of a body is the force with which the earth attracts the body towards the centre


  1. It is a variable quantity and it can be zero


  1. It is a vector quantity, which means it has direction


  1. The units of weight


In CGS system:  dyne

In FPS system:  poundal

In MKS system:  newton


One kilogram force is the force with which a body of mass 1 kg is attracted towards the centre of Earth


That is Weight of a body of mass 1 kg  =  1 kgf  =  1 kgxg   =  9.8N = 10 N  approx.



Weight of a body depends upon gravitational force.


The weight of a body  =  kgxg    (where g = acceleration due to gravity)

Since g is variable so weight is also variable



  1. Weight is measured by spring balance


How weight changes from place to place

Since the value of  g  is highest in the poles so the weight is maximum in the poles

Since the value of  g  is minimal in the equator so the weight is minimum in the equator

Since the value of  g  decreases as we go higher up in the sky so the weight decreases as we go higher up.

Since the value of g decreases as we go deeper inside the earth’s crust so the weight also decreases as we go deeper inside the earth.  Weight of a body is zero at the center of earth.

Since the value of g decreases by 1/6 th in the moon so the weight of a body also decreases by 1/6 th in the moon.   Eg if a body on the earth is 24 N then in  the moon it will be 4 N



16 drums  =  1 ounce  (oz)

16 oz        =   1 pound (lb)

1 ton   =    20 x 4 x 28   =   2240 lb

1 pound    =     253.54 gm

1 kg    =    2.204 lbs


Differences between Mass and Weight

Mass                                                                         Weight

Point No.1 of mass                                         Point No. 1 of weight

Point No.2 of mass                                         Point No. 2 of weight

Point No.3 of mass                                         Point No. 3 of weight

Point No.4 of mass                                         Point No. 4 of weight

Point No.5 of mass                                         Point No. 5 of weight


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Hi viewers My name is Partha Pratim Goswami, (PpG) I am a teacher by profession. I have been teaching biology, chemistry and physics, sometimes mathematics also for last sixteen years. I would like to share my entire experience with all the viewers across the world through YouTube, which I think is an amazing platform to share all my experiences.

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