Question

external pressure decrease thanboiling point of water

Answer 1

When the pressure above a liquid is reduced, the vapor pressure needed to induce boiling is also reduced, and the boiling point of the liquid decreases

Answer 2

When the pressure above a liquid is reduced, the vapor pressure needed to induce boiling is also reduced, and the boiling point of the liquid decreases. At 250 C, water boils at an external pressure of 24 mmHg. As the water boils, heat is lost due to the heat of vaporization of water, which is 40.88 kJ/mol.