The diagram illustrates a mercury manometer attached to a container of gas. Mercury has a density of $14\,000\,\text{kg m}^{-3}$. The gravitational field strength $g$ is $10\,\text{N kg}^{-1}$. What pressure difference exists between the gas in the container and the atmosphere?
- A$28\,000\,\text{Pa}$
- B$42\,000\,\text{Pa}$
- C$56\,000\,\text{Pa}$
- D$84\,000\,\text{Pa}$