Assertion (A)- We can easily move our hand in the air. Reason (R)- The inter-molecular force of attraction between the particle is negligible.
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Particles of air have large spaces between them. On the other hand, wood has little space between its particles. Also, it is rigid. For this reason, we can easily move our hands in air, but to do the same through a solid block of wood, we need a karate expert.
According to the kinetic theory of gases, the force of attraction between the gas molecules is negligible. ... There is no attraction between molecules of a gas among themselves or with molecules of another gas. Each gas will independently contribute its pressure.
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