Hello all,

I have been stuck in this question for at least 3 hours, and i would like to get some tips on how to solve it. First, please check the drawing in the files to understand the water-barometer.

The question is as followed:

"The water-barometer is very sensitive for temperature changes in the flask. For the increase Δh in water level per degree of increase in temperature, the following formula can roughly be applied:

Δh / ΔT = p / (T * ρwater * g)

T is the absolute temperature and p the pressure inside the flask. The atmospherical pressure (outside the flask) is equal to 10^5 Pa. Now roughly calculate the increase of the water level in cm when the temperature of the gas increases from 20° C to 23° C.

Useful data:

ΔT = 3 K

T = 293 K

ρwater = 10^3 kg/m^3

g = 9,81 m/s^2

patmosferical = 10^5 Pa

pflask = unknown

Δh = unknown

h = unknown

Δp = unknown

V = 1,1 dm^3 = (almost) unchanged

n = amount of gas in mole = unknown

How can i calculate p or Δh?

Thanks a lot and merry Christmas!

PS: I am not a native speaker, so excuse me if my language was incorrect.