< p >您可以参考< a href = " //www.hoelymoley.com/q/14899/11908 " > < / >这个问题的更多细节的起源这个公式(基于< a href = " https://en.wikipedia.org/wiki/Dew_point " rel = " nofollow noreferrer " > Magnus近似< / >),但如果你做一些代数表达式有露点(<跨类= " math-container " > TD < / span >美元)作为温度的函数(类< span = " math-container " > T < / span >美元)和相对湿度(<跨类= " math-container " > RH < / span >)美元,你得到< / p > < p > <跨类= " math-container " > RH = 100美元\,e ^{\ \大左(\压裂{c \ b (TD-T)} {(c + T) (c + TD)} \右)}$ < / span > < / p > < p >与< span class = " math-container " > b = 17.625美元< / span >和<跨类= " math-container " > c = 243.04 < / span >美元。< / p > < p >在这种情况下,在< span class = " math-container " > TD < / span >美元是你的一个输入变量,不需要考虑的压力,压力没有影响类< span = " math-container " > RH < / span >美元,或者更确切地说,压力依赖已经被认为是通过< span class = " math-container " > TD < / span >美元。压力将发挥作用,如果你计算类< span = " math-container " > TD < / span >美元从水蒸气压力,因为水蒸气压力就是< a href = " https://en.wikipedia.org/wiki/Relative_humidity # Pressure_dependence”rel = " nofollow noreferrer " > < / >小依赖在大气压力。 The Magnus approximation above is considered valid for:
$0^oC < T < 60^oC$
$1\% < RH < 100\%$
$0^oC < TD < 50^oC$
There are also other equivalent formulas that extends their validity range by changing the constants, like this one
$RH=100\cdot10^{\Large m\left( \frac{TD}{TD+T_n}-\frac{T}{T+T_n}\right)}$
Where values for the constants $m$ and $T_n$ depend on temperature and are tabulated:
See this document for more details.
There are also very simple approximations to these formulas, like
$RH \approx 100 - 5 (T-TD)$
You can find a discussion on the accuracy of this approximation here.