(a)[1]
Define the term pressure.
(b)[3]
The density of mercury is $1.4 \times 10^4\,\text{kg m}^{-3}$. The gravitational field strength $g$ is $10\,\text{N kg}^{-1}$. The atmospheric pressure is $1.0 \times 10^5\,\text{Pa}$. Calculate the pressure of the gas inside the container.
(c(i))[1]
Determine the mercury level, as shown on the ruler, when this happens.
(c(ii))[3]
Explain, in terms of the gas molecules, what makes the mercury levels become equal.