Heat Transfer. Heat transfer  Heat transfer occurs in 3 ways:  Conduction  Convection  Radiation.

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Presentation transcript:

Heat Transfer

Heat transfer  Heat transfer occurs in 3 ways:  Conduction  Convection  Radiation

Read Section 2.4  As you read section 2.4, take notes on these types of heat transfer and give yourself several examples.  Take detailed notes, that are easy for you to understand the difference between the three.

Today  Still no voice today. So same procedure as yesterday.  Begin by completing your bellwork, we will grade it in a moment. As always there will be some differences in wording but if you are genuinely not sure you answer is correct ask me.

Video  As you watch the movie, fill in your notes on anything you may have missed. 

Here are some key points your notes should have.

Conduction  When solids are heated their particles begin to gain energy and begin to vibrate more and more.  This causes them to bump into the neighboring particles giving them energy. If this continues the energy will continue to pass throughout the solid.  Some materials are better at conducting heat from one particle to another than others.

Convection  Usually occurs through liquids and gasses. Because there is more room between particles in a liquid and gas as they are heated they have more space to move.  This causes a change in density in the substance and the matter that has energy begins to rise. As it rises it comes in contact with cooler air and cools down. As it does so it then begins to fall back down to the heat source again.  This creates a circular motion to the substance.

Radiation  Heat transfer occurs can occur through the air or even in empty space. Particles do not have to be in contact for the heat to transfer.  Thermal Radiation causes waves of heat to hit objects. As they do the object begins to gain energy, heating the object.