Calculate saturation vapor pressure — cal_saturation_vapor

Calculate saturation vapor pressure $e_s$ (hPa) from air temperature $T$ (°C).

Usage

cal_saturation_vapor_pressure(t, t_unit)

Arguments

t: Numeric. Air temperature in degree Celsius (°C), degree Fahrenheit (°F), or Kelvin (K).
t_unit: Character string. Unit of the temperature value. Must be one of "celsius", "fahrenheit", or "kelvin".

Value

Numeric value of saturation vapor pressure in hPa.

Details

Saturation vapor pressure $e_s$ (hPa) is the vapor pressure of saturated air. It is calculated using the formula:

$$e_s = 6.108 \cdot exp(\frac{17.27 \cdot T}{T + 237.3})$$

where $T$ is air temperature (°C).

The temperature input is converted to degree Celsius (°C) based on the provided t_unit before calculation.

References

Davis, Robert E., Glenn R. McGregor, and Kyle B. Enfield. “Humidity: A Review and Primer on Atmospheric Moisture and Human Health.” Environmental Research 144 (January 2016): 106–16. https://doi.org/10.1016/j.envres.2015.10.014.

Examples

cal_saturation_vapor_pressure(t = 20, t_unit = 'celsius')
#> [1] 23.38281
cal_saturation_vapor_pressure(t = 68, t_unit = 'fahrenheit')
#> [1] 23.38281