ESS227
Prof. Jin-Yi Yu
The First Law of
Thermodynamics
•This law states that (1) heat is a form of energy that (2) its conversion into other forms of energy
is such that total energy is
conserved.
•The change in the internal energy of a system is equal to the heat added to the system minus the work down by the system:
DU = Q - W
change in internal
energy
(related to temperature)
Heat added to the system
Work done by the system
