The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)

• Q1 - 2 = dU + W1 - 2
• Q1 - 2 = dU - W1 - 2
• Q1 - 2 = dU/W1 - 2
• Q1 - 2 = dU x W1 - 2