Which physical law underlies the first law of thermodynamics? Which physical law underlies the first law of thermodynamics? conservation of matter increase in entropy conservation of energy conservation of work Request Answer Part B The quantity Q is the that is added to the system. The quantity is the that is added to the system. heat work entropy internal energy Request Answer Part C The quantity W in the first law refers to the . View Available Hint(s) The quantity in the first law refers to the . work done on the system work done by the system change of energy in the system change of volume in the system Part D The quantity ΔU in the first law of thermodynamics is the change in the of the system. Choose the correct option. Choose the correct option. entropy internal energy heat energy temperature Request Answer