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?
Answers
Answered by
64
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...
Answered by
6
Answer:
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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