Thermodynamic quantity (4,6)
'thermodynamic quantity' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for enthalpy that I've seen before include "Function for physical chemists" , "Thermodynamic quantity" , "Measure of energy" , "Total heat content of a system" , "Thermodynamic measure of total heat content" .)
'thermodynamic quantity' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for entropy that I've seen before include "Term in physics" , "Measure of the disorder of a system" , "Thermodynamic quantity" , "Degree of disorder (physics)" , "Physical quantity linked to disorder" .)