### Equilibrium in Physical and Chemical Processes

goals
The phase diagram for a pure substance is shown above. Use this diagram and your knowledge about changes of phase to answer the following questions.
The phase diagram for a pure substance is shown above. Use this diagram and your knowledge about changes of phase to answer the following questions.
The phase diagram for a pure substance is shown above. Use this diagram and your knowledge about changes of phase to answer the following questions.
At constant pressure, a sample of helium gas has a volume of $800ml$ at ${27}^{o}C$
At constant pressure, a sample of helium gas has a volume of $800ml$ at ${27}^{o}C$