THERMAL
EXPANSION
Objects
undergo changes in dimension when they are heated. This change in length
or area or volume is called "Thermal Expansion".
WHY BODIES
EXPAND ON HEATING
At a given
temperature, inter-molecular distances are definite. When a body is
heated it's molecules vibrate more energetically against the action of
inter-molecular forces and the displacement of molecules is increased.
Since the average distance between the molecules increases, the
dimension of the body increases. Consequently body expands.
TYPES
OF THERMAL EXPANSION
There
are three types of thermal expansion:
-
Linear
Expansion
-
Superficial
Expansion
-
Volumetric
Expansion
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