When do I use ΔU = Q − W in Thermodynamics & Kinetic Theory, and what does it mean?
first law: change in internal energy from heat and work.
ΔU = Q − W — first law: change in internal energy from heat and work. Use it when: W is work done by the gas. Always check the condition holds before plugging in numbers.
Key point
ΔU = Q − W
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