write 3 difference between radiation and conduction
Answers
Answer:
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Explanation:
Conduction Convection Radiation
The heat transfer in conduction is slow The heat transfer in convection is faster. The heat transfer in radiation is the fastest
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Explanation:
Conduction is a process in which heat is transported between parts of a continuum, through direct physical contact. Convection is the principle, wherein heat is transmitted by currents in a fluid, i.e. liquid or gas. Radiation is the heat transfer mechanism, in which the transition takes place through electromagnetic waves.
Conduction shows, how heat is transferred between objects in direct contact, but Convection reflects how heat travels through liquids and gases. As against this, radiation indicates how heat travels through places having no molecules.
Conduction takes place as a result of the difference in temperature, i.e. heat streams from high-temperature area to low temperature area. Convection happens due to the variation in density, such that the heat moves from low-density region to high-density region. On the contrary, all object release heat, having a temperature more than 0 K.
Conduction usually occurs in solids, through molecular collision. Convection occurs in fluids by mass motion of molecules in the same direction. In contrast, Radiation takes place through the vacuum of space and does not heat up the intervening medium.
The transfer of heat is through heated solid substance, in conduction, whereas in convection the heat energy is transmitted by way of intermediate medium. Unlike, ration uses electromagnetic waves to transfer heat.
The speed of conduction and convection is slower than radiation.
Conduction and convection do not follow the law of reflection and refraction, whereas, radiation obeys the same.