Figure shows an ideal gas. Its pressure, volume & temperature are P 0 , V 0 & T 0 respectively. Thin U-tube contains mercury. It is seen that when 20 cm of extra mercury is added in limb B of U-

Question

Figure shows an ideal gas. Its pressure, volume & temperature are $P_{0}, V_{0}$ & $T_{0}$ respectively. Thin U-tube contains mercury. It is seen that when 20 cm of extra mercury is added in limb B of U-tube and temperature of gas is doubled, level of A is maintained at its position. Consider surrounding to be vacuum. Find the initial pressure of gas (in cm of Hg .)

TestHub · Accepted Answer

Let the initial pressure be P 0 ​ . If level A is maintained, the volume remains the same. If the temperature doubles, the pressure doubles. Therefore, 2 P 0 ​ − P 0 ​ = r g × 20 c m . Thus, P 0 ​ corresponds to 20 cm of Hg.

Physics - Heat & Thermo Question with Solution | TestHub

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JEE Advanced 2027 (Class 12)