A fixed mass of gas occupies a volume $V_1$ at an initial pressure of $p_1$. It then expands while the temperature stays constant until its volume becomes $V_2$ and its pressure is $p_2$. Which statement about the gas pressure and volume is incorrect?
- APressure is measured in $\text{N m}^{-3}$.
- BPressure multiplied by volume is a constant.
- CPressure is directly proportional to $\frac{1}{\text{volume}}$.
- DThe ratio of $V_1$ to $V_2$ is equal to the ratio of $p_2$ to $p_1$.