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Hi viewers:

Today we will discuss about another physical quantity and that is density of a substances and how to measure the density of a substance.  This physical quantity takes derived units, which we will discuss in the following

 DENSITY

What is density?

The density of a substance (solid, liquid and gas) is defined as mass per unit volume at a particular temperature.

OR in other words we can say

The quantity of matter contained in a given volume of a substance at a particular temperature is called its density

 

Density = Mass / Volume

Eg.  Density of water

 

In CGS system, Density of water is 1 gm/cc at 4 °C

In FPS system, Density of water is 62.5 pound/cft

In MKS system, Density of water is 1000 kg/cubic metre

 

Units of density

In CGS system, it is gm/cc

In FPS system, it is pound/cft

In MKS system, it is kg/cubic metre

 

Experiment 1  (Note:  All experiments should be written in passive voice and past tense)

Objective:  To measure the density of an irregular solid that does not dissolve in water

Materials required:  An irregular solid that does not dissolve in water, water, measuring cylinder and a thread

Procedure

Suitable quantity of water was poured in a measuring cylinder, which was enough to immerse the solid completely in it.

The reading of the water level was noted as R1

The solid object was tied to a thread and was immersed into the water.

The level of water was raised was observed

The reading of the new water level was noted as R2

The volume of the solid was R2 – R1

The mass (M) of the solid was found by using physical balance

Therefore density of that solid is equal to M / R2 – R1

 

 

Experiment 2 (Note:  All experiments should be written in passive voice and past tense)

Objective:  To measure the volume of an irregular solid that dissolves in water

Materials required:  An irregular solid that dissolves in water Copper sulphate, Kerosene oil, measuring cylinder and a thread

Procedure

Suitable quantity of kerosene was poured in a measuring cylinder, which was enough to immerse the solid completely in it.

The reading of the kerosene level was noted as R1

The solid object was tied to a thread and was immersed into the kerosene

The level of kerosene was raised was observed

The reading of the new kerosene level was noted as R2

The volume of the solid was R2 – R1

The mass (M) of the solid was found by using physical balance

Therefore density of that solid is equal to M / R2 – R1

 

RELATIVE DENSITY

 

The density of water at 4 °C is maximum and it is chosen as a standard density because the density of water at

4 °C is 1 gm/cc, which is maximum.

 

The Relative Density of a substance is defined as the ration of the density of the substance to the density of water at
4 °C.

The Relative Density is also known as Specific Gravity

Relative Density = Specific Gravity = Density of a substance / Density of water at 4 °C

Since Specific Gravity is a ratio so it has got no unit

Specific Gravity = Density of a substance / Density of water at 4 °C

=  Mass of a substance ÷ Volume /  Mass of a water ÷ Volume

=  Mass of a certain volume of a substance / Mass of a equal volume of water

 

The density of aluminium is 2700 kg/m3

The density of water is 1000 kg/m3

The Specific gravity of aluminium is  2.7

 

So, If you have enjoyed reading How to measure Density of a substances post I would be very grateful if you would help it to spread by sharing on social media like Facebook, Twitter, Google+, by clicking on the share buttons below. If you have any questions or comments, feel free to ask them in the comment section below.

See you in my next blog post.

PpG

 

Also Read on Science Reckoner:

 

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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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