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A barometer reads 75.0 cm on a steel sca...

A barometer reads 75.0 cm on a steel scale. The room temperature is `30^o C`. The scale is correctly graduated for `0^C`. The coefficient of linear expansion of steel is `alpha=1.2 xx 10^(-5) C^(-1)` and the coefficient of volume expansion of mercury is` sigma=1.8 xx 10^(_4) C^(-1).` ? Find the correct atmospheric pressure.

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