THERMAL EXPANATION

  

1.       Expanation of solids : When a solid is heated.It expends in all direction.The expansion in any direction is called its linear expansion.

2.       When a force or surface of the solid is increase due to heating, It called surface or superficial expression and the dilution or increase in volume is called the volume or cubical expansion.

3.       The co-ficient of linear expression is defined as the increase in length per unit length for a rise in temperature of 1 degree.

Superficial and volume Expansion: The area of volume of body are both increase according to the increase in its temperature.

LINEAR EXPANSION COFFICIENT PER DEG.C

Nickle	13.0
platinium	8.86
Tangeston	4.5
Brass	18.9
invar	1.0
steel	11.0
Glass(flint)	8.8

SUBSTANCE
Aluminium	22.2
copper	16.66
cadmium	31.59
lead	28.0
Malybednum	5.20