निम्नलिखित ग्राफ में एक आदर्श गैस के तीन दाबों \(P_1, P_2\) व \(P_3\) पर \(\mathrm{T}-\mathrm{V}\) वक्र प्रदर्शित करता है (जहाँ \(\mathrm{T}\) तापमान, \(V\) आयतन) जिसकी चार्ल्स नियम की बिन्दु रेखा द्वारा तुलना की गई है। तब सही संबन्ध है:

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.