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 .
A more specific definition of boiling point is the temperature at which vapor pressure a liquid equal to external. Any change of state from a liquid to gas at boiling point is considered explain why water boils 90 o c in the mountains and 120 pressure cooker, even though normal 100 c, we have understand.