Boiling is when liquids are heated above their boiling point.
If the pressure is reduced, the boiling point is lowered.
Less heating is required to make a liquid boil if the pressure is reduced.
To make a liquid boil more easily when heat is applied, one should
  degrees Celsius
  Evaporation of water
  absorb light energy
  heat is produced
  aqueous solution
  lower the surrounding pressure
  evaporative cooling
  depress neuronal excitability