· Heat is a form of Energy.
· Heat means Heat Energy.
· Temperature measures the degree of hotness or coldness of a body.
· When a body or object gains heat its temperature increases.
· When a body or object loses heat its temperature decreases.
Units For Measuring Heat
Expansion of Solids
Conceptual Points
· Solids on heating (generally).
· Expansion means increase in dimensions (size) of the solid.
· Solids are of three types
A)One Dimensional (1-D)
B)Two Dimensional (2-D)
C)Three Dimensional (3-d)
· A 1-D solid has only one prominent or significant dimension i.e. length
· A two dimensional solid has only two prominent or significant dimensions i.e. length and breadth
· A three dimensional solid has three prominent or significant dimensions i.e. length, and height
· Linear Expansion is only possible in case of one dimensional solids on heating.
· Areal Expansion or Superficial Expansion occurs in case of two dimensional solids on heating.
· Volume Expansion or Cubical Expansion occurs in case of three dimensional solids on heating.
· One dimensional solid size means length.
· Two dimensional solid size means area.
· Three dimensional solid size means volume.
Types of Expansion in solids
