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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How is molecular motion related with temperature?
What is diffusion ? Give an example to illustrate it.
Define absolute zero and absolute scale of temperature.
(a) Define S.T.P.
(b) Why is it necessary to compare gases at S.T.P.?