A jar contains a gas and few drops of water at $T K.$ The pressure in the jar is $830 \,mm$ of mercury. The temperature of jar is reduced by $1\%.$ The saturated vapour pressure of water at the two temperatures are $30 \,mm$ and $ 25\, mm$ of mercury. Then the new pressure in the jar will be ..... $mm$ of $Hg$
Diffcult
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