(a)[3]
The separation between the liquid levels is $h$. For room temperature, $h$ is 0.57 m. The liquid density is $1.4 \times 10^4\,\text{kg m}^{-3}$. The gravitational field strength $g$ is $10\,\text{N kg}^{-1}$ and atmospheric pressure is $1.0 \times 10^5\,\text{Pa}$. Calculate the pressure of the trapped air.
(b(i))[3]
The trapped air height in the tube is $x$. Explain, in molecular terms, why $x$ changes when the air is heated.
(b(ii))[2]
The trapped air settles to a constant temperature above its original temperature. Describe and explain how $h$ changes in terms of the pressures involved.