WHAT IS CONDUCTION, CONVECTION, RADIATION AND INSOLATION ?

Heat is a form of energy that is transferred between two substances at different temperatures.

• The energy flow is from the substance of higher temperature to the substance of lower temperature.

                            Transference of heat   


Heat is transferred from one place to another in three ways:

• Conduction - In this case, heat is transferred from one place to another, through a solid, by direct contact between molecules. Some substances are good conductors of heat such as Metal objects whereas some are bad conductors of heat such as wooden pieces.

• Convection - It is the transference of heat in a fluid (gas or liquid) by the movement of molecules. If one corner of a bowl of water is heated, the water particles move about and the heat is distributed throughout the entire body of water.

• Radiation - It is the transference of heat from one place to another through space, without the necessity of any intervening medium. Heat given off by the Sun travels through space and reaches the earth by the process of radiation. 

                                  INSOLATION

Insolation is the name given to all forms of energy received by the earth, from the Sun, by the process of radiation. Insolation includes light, heat, ultra-violet rays, infra red rays etc. 

Insolation comes in the form of energy of very short wave length.Energy of such short wave length has the property of passing through transparent media without heating the media. 


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