The dipole-dipole forces exist only between polar molecules. All hydrogen containing molecules show hydrogen bonding. Hydrogen bonding exists when molecules have any of the following combinations. Strong interactions between molecules result in low melting points. All liquids have a vapor pressure.
Vapor pressure is high above a volatile liquid.
All solids have a definite crystal structure. Evaporation and boiling are the same. People sweat so the evaporation of water can help regulate body temperature.