متطلبات الإكمال
Any homogeneous part of a system constitutes a phase.
A single-phase system has only one phase.
A mixture of gases constitutes a single-phase system.
A polyphase system has several phases and is a heterogeneous system.
A gas containing smoke is a polyphase system.
Note
Sign conventions.
Everything received by the system is counted positively.
Everything given up by the system is counted negatively.