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2015-11-20T18:51:20+05:30
Heat transfer is the exchange of thermal energy between physical systems, depending on the temperature and pressure, by dissipating heat. The fundamental modes of heat transfer are conduction or diffusion, convection or radiation.
      Heat transfer always occurs from a region of high temperature to another region of lower temperature. 
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what is diffusion
the intermixing of particles of 2 different types of matter on their own is called diffusion.
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