Question

Which condition applies when water boils at 100°c? air pressure equals a specific value (101.3 kpa) air pressure is less than its value at the triple point of water air pressure is zero, as in a vacuum vapor pressure is zero

Answer 1

Water normally boils when the vapor pressure of water is equal to the external pressure. That is, at 100 degree Celsius, the external vapor will be 101.3 kpa. The correct answer is A.