Physical Chemistry Chapter 7 The phase rule Phase: a state of matter that is uniform throughout in chemical composition and physical state. ( Gibbs) Number of phase(p) e Gas or gaseous mixture -single phase Liquid -one, two and three phases two tally miscible liquids- single phase a slurry of ice and water -two phases Solid -a crystal is a single phase an alloy of two metals-two phases(immiscible) one phase(miscible2 The Phase Rule Phase: a state of matter that is uniform throughout in chemical composition and physical state. (Gibbs) Number of phase (p): Gas or gaseous mixture – single phase Liquid – one, two and three phases two tally miscible liquids – single phase a slurry of ice and water – two phases Solid – a crystal is a single phase an alloy of two metals – two phases (immiscible) - one phase (miscible) Physical Chemistry Chapter 7