(a) Water boils at 100°C when pressure around the water is atmospheric pressure, that is 1atm = 1.01105 Pa.
(b) a liquid evaporates below its boiling point. In this process Liquid Molecule collide each other and transfer energy to each other, so that molecule at surface absorbs enough energy to overcome the vapor pressure.
(c) Solids have Lowest inter particle space. That’s why Solids have fixed shape and size.
(d) Gases have the weakest inter particle Forces. That’s why gases do not have fixed size and shape.
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