Question

A certain fortin barometer has it's pointers , body and scales made from brass. when it is at 0 degree sentigrate it records a barometric pressure of 760 hg mm of Hg. what will it read when its temprature is increased to 20 degree sentigrate if the pressure of the atmosphere remains uncharged ? [ cubic expansivity of mercury (Y)=1.8*10^-4 k^-1, Linear expansivity of brash (alpha)= 2*10^-5 K^-1]

Answer 1

Answer:

The brass scale of a barometer gives correct reading at 0

o

C. The barometer reads 75cm at 27

o

C. what is the correct atmospheric pressure at 27

o

C. Tne coefficient of linear expansion α of brass is 2.0×10

−5

degree/celcius