.
air08 Visualisation by beads: Liquid air expands extremely during evaporation

Left photo: Due to very low mobility the molecules of nitrogen N₂ (bue twin beads) and  oxygen O₂ (red twin beads) as well as atoms of argon Ar (big bead) are close together in liquid air.
Right photo: During evaporation the mobility of these particles increases extremely resulting in a much bigger demand for space.