This computes the compressibility of the gas depending on the mixture.

As it turns out, the van der Waals equation gives results that are
numerically not really useful, so we use the Redlich Kwong equation
which is, according to Wikipedia, much more accurate, which can be confirmed
given the empirical values for air.

As opposed to the previous approach with a look-up table, this takes
into account the actual gasmix. This always assumes the gas to be at
20 degrees Centigrade.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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