A 10CM COLUMN OF AIR IS TRAPPED BY AN 8CM LONG COLUMN OF Hg in a capillary tube horizontally fixed at 1 atm pressure . calculate the length of air column .when the tube is fixed

a) Vertically with open end up

b) Vertically with open end down

c) At 45o from the horizontal with the open end up .

a.

A=area of corresponding capillary

L=length of capillary

 

(b)

use

P1L1=P2L2

 

(C) use

 Patm.A1+mgcos45ยบ = Pgas.A2

 

 

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