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At which situation intermolecular forces...

At which situation intermolecular forces becomes effective ?

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At high pressure : Attraction forces becomes effective between molecules then change in pressure is `(an^(2))/(V^(2))`.
`p_("ideal")=p_("real")+(an^(2))/(V^(2))`
At high pressure : Repulsive forces becomes effective between molecules then change in volume in nb.
`V_("ideal")=(V_("real")-nb)`
At very low temperature : Intermolecular forces become significant. As the molecules travel with low average speed, these can be captured by one another due to attractive forces.
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