PHYSICAL CHEMISTRY IN BRIEF

CHAP. 7: PHASE EQUILIBRIA [CONTENTS] 183

s

s

TNFP TNBP T

pst

p

T 1

T 2

(sβ)

(sα) (l)

(g)

sC

Obr.7.1:Phase diagramp−T of a one-component system. pstis the normal pressure,TNFPis the
normal melting (freezing, fusion) temperature, andTNBPis the normal boiling temperature. Point C
is the critical point,T 1 andT 2 are the triple points.

Example

Describe what is going on in a system whose phase diagram is shown in Figure7.1during heating

at constant pressurep=pst.