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# JEE Class main Answered

Find pressure in mercury coloum
Asked by ashutosharnold1998 | 21 Dec, 2019, 08:56: AM
Expert Answer
For ideal gas, at constant volume, pressure is proportional to temperature.

Let pressure varies as, P = a × T + b , where a and b are constants

at t = 0oC , P = 60 cm of mercury column.    hence we have,  60 = a×0 + b , i.e., b = 60

at t = 100°C , P = 100 cm of mercury column. hence we have, 100 = a×100 +60  i.e., a = 0.4

Hence pressure at t = 80°C  , P = 0.4 × 80 + 60 = 92 cm of mercury
Answered by Thiyagarajan K | 21 Dec, 2019, 09:30: AM

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