Phase Change Diagram: Key
Condensation: the substance
changes from a gas to a liquid.
100⁰C
Freezing: the substance
changes from a liquid to
a solid.
Vaporization (or boiling):
the substance changes
from a liquid to a gas.
0⁰C
Melting: the substance
changes from the solid
to the liquid.
Characteristics of Solids
Characteristics of Liquids
Characteristics of Gases
•Have definite volume and shape
•Have a definite volume, but indefinite shape
•Have an indefinite volume and shape
•Molecules have energy to
vibrate, but do not move freely
•Molecules can flow and move around, but
still stay close together
•Molecules have energy to move fast & freely and
escape one another
•When heated, solids expand and
when cooled, they compress
•When heated, liquids evaporate and when
cooled, they condense
•When heated, gases expand and when cooled, they
compress