The first known US drone strike against Al Qaeda operatives took place in Yemen on November 4, 2002. The attack, conducted by the CIA, took out a car carrying six suspected militants, including Abu Ali (a.k.a., Qaed Senyan al-Harthi), a former security guard for Osama bin Laden.
Boiling point is the temperature at which vapour pressure of liquid becomes equal to the atmospheric pressure. More is the vapour pressure lesser will be the heat require to raise its vapour pressure . So more is the vapour pressure lower is the boiling point .
The boiling point of water depends on the atmospheric pressure and the boiling points of water at atmospheric absolute pressures ranging 0.5 - 1000 psia are indicated in the diagram and table below. 1  water-pressure and boiling points in pdf-format.