Aptitude Test Problems in Physics Science for Everyone by S Krotov ( PDFDrive.com )

236 Aptitude Test Problems in Physics

Hence we can find the latent heat of sublimation

of water at the triple point:

v = X, q = 2.82 x 10 6 Pkg.

PA

Ptr

Ttr

(^) T
Fig. 203
2.33. The concentration of the solution of sugar
poured above a horizontal surface practically re-
mains unchanged.
After the equilibrium sets in, the concentration
of the solution in the vessel will be
cihi
The concentration changes as a result of evaporation
of water molecules from the surface (concentration
increases) or as a result of condensation of vapour
molecules into the vessel (concentration decreases).
The saturated vapour pressure above the solution in
the cylindrical vessel is lower than that above the
solution at the bottom by Ap = 0. 05 Psat (c—c0.
This difference in pressure is balanced by the
pressure of the vapour column of height h:
Pvgh = 0. 05 Psat — c2).
Hence we obtain
c
h
h-
Pvg
0. 0 5P Sa t (c