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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.

MEASUREMENTS OF MASS and WEIGHTS

Mass

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?
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

 

Conversion

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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See you in my next blog post.

PpG

 

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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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