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Explain What is the value of surface tension at critical temperature ?

Explain What is the value of surface tension at critical temperature ?

Grade:11

2 Answers

jyoti dogra
29 Points
9 years ago

Ans : the answer is Zero

 

but how ???????

 

please help !!

Devesh Lall
35 Points
9 years ago

ANSWER

Since surface tension is the surface of the stretched film per unit increase in area provided that the temp. remains constant.

Mathematically, at critical temp. surface tension is equal to the perpendicular force acting on the free surface of liquid film.

Its S.I. unit is N/m & its formula is :- T=F/L 

The values of surface tension of differnt liquids at critical temp. at N/m are:-

1.) Mercury - 0.465 

2.) Water   - 0.075

3.) Soap Solution - 0.03

4.) Glycerine - 0.063

5.) Carbon Tetrachloride - 0.027

6.) Ethyl Alcohol - 0.022

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