Define :- (a) Conduction (b) Convection
Answers
a) Thermal conduction is the transfer of internal energy by microscopic collisions of particles and movement of electrons within a body. The colliding particles, which include molecules, atoms and electrons, transfer disorganized microscopic kinetic and potential energy, jointly known as internal energy.
b)When a fluid, such as air or a liquid, is heated and then travels away from the source, it carries the thermal energy along. This type of heat transfer is called convection. The fluid above a hot surface expands, becomes less dense, and rises.
Answer:
conduction-The process by which heat or electricity is directly transmitted through the material of substance when there is a difference of temperature or of electrical potential between adjoining regions, without movements of the material.
Convection-The movements caused within a fluid by the tendency of hotter and therefore less dense material to rise,and colder,denser material to sink under the influence of gravity, which consequently results in transfer of heat..