type, public, abstract :: PsiFunction

$\psi(T)$ function

UNIFAC $\psi(T)$ functions abstract type

Abstract derived type for UNIFAC models temperature dependent functions

Interface subroutine for UNIFAC models temperature dependent functions

Type	Intent	Optional		Name
class(PsiFunction)			::	self	PsiFunction type variable
class(Groups)			::	systems_groups	Groups type variable containig all the system’s groups. See the `groups_stew` variable on the `UNIFAC` documentation.
real(kind=pr),	intent(in)		::	T	Temperature [K]
real(kind=pr),	intent(out),	optional	::	psi(:,:)	$\psi(T)$
real(kind=pr),	intent(out),	optional	::	dpsi_dt(:,:)	$\frac{d \psi (T)}{dT}$
real(kind=pr),	intent(out),	optional	::	dpsi_dt2(:,:)	$\frac{d^2 \psi (T)}{dT^2}$