PPT Slide

p

T

P-T phase diagram

solid

liquid

vapor

Melting/freezing

Substances that contract

on freezing

Substances that expand

on freezing ex. Water.

Higher pressure makes

it more difficult to freeze, thus requiring

lower freezing temperature. The reverse is true for substances that contract on freezing

Critical point

Vaporization/condensation

Sublimation

Triple point: all three phases

coexist in equilibrium

Critical point: A limiting state above which there is no clear distinction between

liquid and vapor phases.

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