When the external pressure is 101.3 kPa torr, water will boil at what temperature?
A. 12.8°C
B. 14.5°C
C. 18°C
D. 100°C
When the vapor pressure of water is 101.3 kPa, the temperature is 100°C. When the atmospheric pressure above a liquid equals its vapor pressure, the liquid will boil. If the vapor pressure was 50 kPa, water would boil at about 82°C.