The brass scale of a barometer gives correct reading at 0 degree celci

1.	The brass scale of a barometer gives correct reading at 0 degree celcius. Coefficient of thermal expansion of brass is 20×10^-6 degree/celcius. The barometer reads 75 cm at 27 degree celcius. What is the atmospheric pressure at 27 degree celcius?
Answer» Hii FRIEND, # Answer- L = 75.0405 CM # Given- Lo = 75cm α = 20×10^-6 /degree-celcius ΔT = 27 – 0 = 27 degree-celsius L = ? # Formula- We'll USE the formula for the coefficient of linear expansion L = Lo ( 1 + αΔT) L = 75 (1 + 20×10^-6 × 27) L = 75 (1 + 0.00054) L = 75 × 1.00054 L = 75.0405 cm Atmospheric PRESSURE at 27℃ is 75.0405 cm of brass. Hope that was useful...

The brass scale of a barometer gives correct reading at 0 degree celcius. Coefficient of thermal expansion of brass is 20×10^-6 degree/celcius. The barometer reads 75 cm at 27 degree celcius. What is the atmospheric pressure at 27 degree celcius?

Answer»

Hii FRIEND,

# Answer- L = 75.0405 CM

# Given-

Lo = 75cm

α = 20×10^-6 /degree-celcius

ΔT = 27 – 0 = 27 degree-celsius

L = ?

# Formula-

We'll USE the formula for the coefficient of linear expansion

L = Lo ( 1 + αΔT)

L = 75 (1 + 20×10^-6 × 27)

L = 75 (1 + 0.00054)

L = 75 × 1.00054

L = 75.0405 cm

Atmospheric PRESSURE at 27℃ is 75.0405 cm of brass.

Hope that was useful...

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The brass scale of a barometer gives correct reading at 0 degree celcius. Coefficient of thermal expansion of brass is 20×10^-6 degree/celcius. The barometer reads 75 cm at 27 degree celcius. What is the atmospheric pressure at 27 degree celcius?

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