Heat is a form of energy which transfers between bodies which are under thermal interactions. Heat transfer occurs when a temperature difference occurs between two bodies or a body with its surroundings.
There are three modes of heat transfer:
- Conduction
- Convection and
- Radiation
CONDUCTION: Conduction is the mode of heat transfer which occurs from one part of a substance to another part within the substance itself or with another substance which is placed in physical contact.
CONVECTION: Heat transfer occurs within a fluid itself and it is carried out by transfer of one fraction of the fluid to the remaining portion.
RADIATION: This mode of heat transfer does not require any medium to occur. Every matter with a temperature above absolute zero will emit energy in the form of electromagnetic waves called radiation.
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