For a typical transport aircraft landing at an airport, these conditions are as follows: T i {\displaystyle T_{\text{i}}} and p i {\displaystyle p_{\text{i}}} have values corresponding to the so-called standard conditions, i.e., p i {\displaystyle p_{\text{i}}} = 1 atm = 1013.25 mb = 101 {\displaystyle \,} 325 Pa and T i {\displaystyle T_{\text{i}}} = 293.15 K (which is 20 °C = 68 °F). The relative humidity is a comfortable 35% (dew point of 4.1 °C = 39.4 °F). This corresponds to a partial pressure of water vapor of 820 Pa = 8.2 mb.