What is transfer of heat ? Explain types of heat?
Answers
Answer: Heat transfer is the movement of heat from one substance or material to another. Heat transfer takes place through three principal mechanisms: conduction, radiation, and convection. Heat is transferred via solid material (conduction), liquids and gases (convection), and electromagnetic waves (radiation). Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.
Answer:
Transfer of heat : Heat is just a form of energy or say, heavy movement of electrons in the tiny space. What causes heat is this movement, in a metal (electropositive element) the outmost electrons are free to move as nucleus has no more potential to reach its force to these electrons so it sets them free.
Main : Assume you are moving with speed of 1 km/h and what you have now is the kinetic energy. Suppose, you hit somebody then some of this energy is transferred to that fellow. He gains your momentum in that collision. This is what happens when transfer of heat takes place. When electropositive element come in contact with another of that kind then electrons of body in heat attack to the second electropositive element and these excited particles transfer their kinetic energy to electrons of second electropositive elements. Their comes heat in that metal.
Why electronegative cannot transfer or conduct heat?
Because, they don't have any electrons free to conduct heat for them.
without electrons their is no heat or electricity.
Types of heat --
1 ). Conduction : When heat is transferred between solid to solid is called conduction.
2 ). Convention : When heat is transferred between liquids and gases is called convention.
3 ). Radiation : The fastest mode of transfer of heat, electromagnetical waves. In this heat is transferred between bodies without any media but waves. e.g. Radiation coming from sun to the earth is proceeded by radiation.
Types of radiation : Infrared and Ultraviolet-Rays(UV) radiations.