Value of 0° Celsius in ° Kelvin

Base of natural logarithms

See https://www.omnicalculator.com/physics/dew-point#how-to-calculate-dew-point-how-to-calculate-relative-humidity

Standard atmospheric pressure, in Pascals. I don’t know why this isn’t 100,000, but it isn’t. See https://en.wikipedia.org/wiki/Standard_atmosphere_(unit)

Critical pressure for water, in Pascals

Specific gas constant for water vapour (J/(kg⋅K))

Critical temperature for water, ° Kelvin