Expansion and contraction

EXPANSION AND CONTRACTION
OF MATERIALS

~Material will expand when gaining heat and contract
when losing heat.

~The expansion of material occurs when materials such
as solids, liquids and gases gain heat from the surrounding.

~The contraction of material occurs when materials such as
Solids, liquids, and gases lose heat to the surrounding.



Thermometer

The liquid in the thermometer will expand or contract when
expose to different surrounding temperature.







The Importance of expansion and Electric cables are hung loosely
contraction principle of materials The electric cables are hung loosely
between the electric poles to allow
The effect of heat on a material can cause the material to the wires to contract when the
Undergo expansion and contraction. The situations in the temperature decreases.
pictures below show the process of expansion and contraction
materials in daily life. Gaps between connectors on the railway tracks
The gaps between the connectors
Gaps between connectors on a metal bridge on a railway track allow the track to
expand when the temperature of
the gaps between metal connectors on the surrounding increases.
bridge allow the bridge to expand when
the temperature of the surrounding
increases.