Ch. 11 Lesson 3How do phase

changes occur?

state (phase)

of matter

shape/

volume

description

solid definite shape & volume

forces keep

particles close

together

state (phase)

of matter

shape/ volume

description

liquid no definite shape- definite volume

takes shape of container

state (phase) of

matter

shape/volume

description

gas no definite shape-

no definite volume

particles far apart

freezing pointfreezing point• same as melting pointsame as melting point

• physical propertyphysical property

• water = 0water = 0ooCC

– lower when salt added lower when salt added

•when materials cool get smaller b/c particles have less space between them

•except water

Water expands when it freezes.

boiling point• temp. @ which liquid turns into gas bubbles

• physical property

evaporation•when particles leave a liquid’s surface gas

condensation•gas liquid

F18 crossing the sound barrierwith vapor condensation

invisible man

•dew forms when water vapor cools

steam • tiny water droplets

• liquid state of water