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In an isothermal process on an ideal gas, the pressure increases by 0.5%. The volume decreases by about
Let the initial values of pressure and volume be P1 and V1, and let the final values of pressure and volume be P2 and V2.
Now for an isothermal process, PV = constant .. (i)
This gives us: P1V1 = P2V2.. (ii)
Since the pressure increases by 0.5%, the new pressure is
Substituting this value in (ii) :
P1V1 = 1.005P1V2
Hence, the volume decreases by (1-0.995) = 0.005 = 0.5%
Hence, the correct option is (b).