Under what condition solid liquid, equilibrium can exist?
At the melting point or freezing point.
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What kind of molecules in a liquid can evaporate?
The molecules having high kinetic energies can evaporate.
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What is equilibrium?
It may be defined as a state in all changes or reactions carried in a closed vessel, where the measurable properties of the system such as colour, density, vapour pressure, concentration, temperature etc. do not show any further noticeable change.