Q. If no heat is exchanged in a process (Q = 0), the first law becomes

यदि किसी प्रक्रिया में कोई ऊष्मा का आदान-प्रदान नहीं होता है (Q = 0), तो पहला नियम बन जाता है

W = ΔU
डब्ल्यू = Δयू

ΔU = -W

Q = ΔU
क्यू = ΔU

ΔU = Q – W
ΔU = Q - W

If $Q = 0$ (adiabatic process), the first law reduces to:

0 = \Delta U + W \quad \Rightarrow \quad \Delta U = -W

meaning the change in internal energy equals the negative of work done by the system.

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