Question:

What will happen when the pressure is doubled in an isothermal process for a closed system containing a fixed amount of an ideal gas?

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"Isothermal" = Constant Temperature. If $P$ goes up, $V$ must go down by the same factor.
Updated On: May 13, 2026
  • Volume will double
  • Volume will halve
  • Temperature will increase slightly
  • Temperature will decrease slightly
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The Correct Option is B

Solution and Explanation


Step 1: Concept

An isothermal process occurs at constant temperature. For an ideal gas, this is governed by Boyle's Law: $P_1V_1 = P_2V_2$.

Step 2: Meaning

Boyle's Law states that pressure and volume are inversely proportional when temperature is held constant ($P \propto 1/V$).

Step 3: Analysis

If the pressure is doubled ($P_2 = 2P_1$), then according to the relation $V_2 = (P_1/P_2)V_1$, we get $V_2 = (P_1/2P_1)V_1 = V_1/2$.

Step 4: Conclusion

Therefore, the volume of the gas will be reduced to half of its initial value. Final Answer: (B)
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