Question

The normal boiling point of water is 100.0 C. Do you expect the boiling point of water to be greater than, less than, or equal to 100.0 C on top of Mt. Whitney, CA where the atmospheric pressure is significantly different than 760 Torr?

Answer 1

The boiling point of a liquid, including water, is the temperature at which the vapor pressure equals atmospheric pressure. So at sea level atmospheric pressure is 760 mm Hg so water boils at 100. On top of Mt Whitney the pressure may be say 700 mm Hg. So the water will boil (less than/more than) 100 C.