What do you understand by gas?
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Gas is a state of matter in which inter-particle attraction is weak and inter-particle space is so large that the particles become completely free to move randomly in the entire available space.
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What is diffusion ? Give an example to illustrate it.
(a) Define S.T.P.
(b) Why is it necessary to compare gases at S.T.P.?
How is molecular motion related with temperature?
Define absolute zero and absolute scale of temperature.