For example, in the case of liquid-gas transition, at each pressure there is a special "transition temperature" T c {\displaystyle T_{c}} such that if the sample temperature is even a little above T c {\displaystyle T_{c}} , the sample will be a gas, but, if the sample temperature is even a little below T c {\displaystyle T_{c}} , the sample will be a liquid; see phase transition. For example, at the standard atmospheric pressure, T c {\displaystyle T_{c}} is 100 °C = 212 °F. The transition temperature T c {\displaystyle T_{c}} decreases with decreasing pressure (which explains why water boils at lower temperatures at higher altitudes and at higher temperatures in a pressure cooker; see here for more information). In the case of water vapor in air, the T c {\displaystyle T_{c}} corresponding to the partial pressure of water vapor is called the dew point.