- The phase change that occurs during freezing is an isothermal process because it occurs at a constant temperature.
- The pressure remains constant during an isobaric process, which is a thermodynamic process.
- This is often accomplished by encouraging the volume to expand or compress which counteracts any pressure increase brought about by heat transfer.
- Boiling water into steam or freezing water into the ice are two examples of isobaric processes.
- A gas either expands or contracts to maintain constant pressure, allowing the system or piece of equipment to perform pure work.
Hence, freezing is not isobaric.