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In Fluids (Liquids and gases), Convection particles can move easily from one place to another. Recall that  Radiation is the direct  transfer of energy radiation. electomagnetic waves are moving  especially high energy particles that cause ionization. conduction  process's by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material. for example .If two objects have a different temperature, heat will flow from the warmer object to the colder one. The heat will continue to flow until the objects are at the same temperature, that is heat flow. For example when you hold an ice in your hand , heat  from your hand warms the ice cube causing it to melt.

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Heat Transfer- Conduction, Convection, Radiation