The Gibbs equations are of prime importance when it comes to problem solving in any thermal oriented subject. The two equations are 'similar' and give the same information.
GIBBS1: dh=Tds-vdp
GIBBS 2:du=Tds-pdv
But the conditions to apply GIBBS1 and GIBBS2 are different. I always get confused as to which equation is to be applied...so I decided to make a this poem ---
ROSES ARE RED
VIOLETS ARE BLUE
Open systems use 'h'
Closed systems use 'u'
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