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Pressure and Temperature

The brass sca...

Question

The brass scale of a barometer gives a reading at zero degree celsius. The Barometer reads 75 cm at 27 degree Celsius. What is the correct atmospheric pressure at 27 degree Celsius. The coefficient of linear expansion Alpha of brass is 2.0 × 10 ^-5 /°c

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Solution

Use the formula for the coefficient of linear expansion

L = Lo ( 1 + αΔT)

Lo = 75cm

α = 0.00002 /degree-celcius

ΔT = 27 – 0

We can get the value of L after going through simple calculation

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