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A barometer with a brass scale correct a...

A barometer with a brass scale correct at `0^(@)C` reads 70 cm of mercury on a day when the air temperature is `40^(@)C`. The correct reading at `0^(@)C` is (Coefficient of real expansion of mercury is `0.00018//^(@)C` and the coefficient of linear expansion of brass is `0.000018//^(@)C`.

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`69.55 cm`
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