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Which two properties are used to determine which substance has the higher temperature?
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1. Intro to General Chemistry
Temperature
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If water boils at 100 °C at 1 atm pressure, which of the following statements is correct?
A
At higher altitudes, water boils at a temperature higher than 100 °C.
B
At higher altitudes, water boils at a temperature lower than 100 °C.
C
The boiling point of water is always 100 °C, regardless of pressure.
D
Water cannot boil below 100 °C under any circumstances.
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Understand that the boiling point of a liquid is the temperature at which its vapor pressure equals the external pressure.
Recall that at 1 atm pressure, water boils at 100 \( ^\circ C \).
Recognize that at higher altitudes, atmospheric pressure is lower than 1 atm.
Since boiling occurs when vapor pressure equals external pressure, a lower external pressure means water will boil at a lower temperature.
Therefore, at higher altitudes, water boils at a temperature lower than 100 \( ^\circ C \).
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