Psychrometric constant

The psychrometric constant $\gamma$ relates the partial pressure of water in air to the air temperature. This lets one interpolate actual vapor pressure from paired dry and wet thermometer bulb temperature readings.

Both $\lambda_v$ and $MW_{ratio}$ are constants.
Since atmospheric pressure, P, depends upon altitude, so does $\gamma$ .
At higher altitude water evaporates and boils at lower temperature.

单词	Psychrometric constant
释义	Psychrometric constant 英语百科 Psychrometric constant The psychrometric constant $\gamma$ relates the partial pressure of water in air to the air temperature. This lets one interpolate actual vapor pressure from paired dry and wet thermometer bulb temperature readings. Both $\lambda_v$ and $MW_{ratio}$ are constants. Since atmospheric pressure, P, depends upon altitude, so does $\gamma$ . At higher altitude water evaporates and boils at lower temperature.
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