Return the isobaric expansion coefficient
This function returns the isobaric expansion coefficient,
βp = - 1 ⁄ v   (∂ v ⁄ ∂ T)p,
where
v is the specific volume,
T is the temperature and
p is the pressure.
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December 18, 2013, by Michael Wetter:
 First implementation.
Generated at 2025-10-31T19:31:39Z
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