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Fourier's law (compare to Ohm's law)Φ = 	P	 = 	ΔQ	 = − k ∇TA	A Δt

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Fourier's law (compare to Ohm's law)Φ = 	P	 = 	ΔQ	 = − k ∇TA	A Δt

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The transfer of heat between two parts of a stationary system, caused by a temperature difference between the parts.

Heat conduction is the flow of internal energy from a region of higher temperature to one of lower temperature by the interaction of the adjacent particles in the intervening space.

Factors affecting the rate of heat transfer by conduction.

1. temperature difference

2. length

3. cross-sectional area

4. material

An example of this is warming your back muscles with a heating pad.

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The transfer of heat from one place to another by the movement of fluids.

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy.

An example of convection is an oven, because when cooking food in an over, the heat expands through the particles in the air from the heat source and go into the item you are cooking.

Heat Transfer, hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatra.html.
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatra.html

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Convection

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Elert, Glenn. “Conduction.” Conduction – The Physics Hypertextbook, physics.info/conduction/.

“Temperature System.” How Does Heat Move?, www.qrg.northwestern.edu/projects/vss/docs/thermal/1-how-does-heat-move.html.

https://www.engineeringtoolbox.com/radiation-heat-transfer-d_431.html

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Note: it's the rate (Φ) at which heat is transferred, not the amount (Q) of heat transferred.

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Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted through empty space by thermal radiation often called infrared radiation. This is a type electromagnetic radiation .

Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth. In fact, all hot things radiate heat to cooler things.

An example is a fire heating up your body (without touching the fire).