A water manometer is used to determine the pressure of a gas in a cylinder. The density of water is $1000\,\text{kg m}^{-3}$, and the gravitational field strength $g$ is $10\,\text{N kg}^{-1}$. What is the gas pressure in the cylinder, measured above atmospheric pressure?
- A$200\,\text{Pa}$
- B$2000\,\text{Pa}$
- C$20\,000\,\text{Pa}$
- D$200\,000\,\text{Pa}$