Thermodynamics.

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Presentation transcript:

Thermodynamics

Heat Transfer Heat Transfer is the movement of heat energy from one material to another. There are three forms of heat transfer.

Heat transfer by conduction Heat transfer in solids, liquids, gases, plasma (all states of matter) Is a result of direct contact with a heat source Is a result of movement of electrons The pan is in direct contact with the heat source and allows heat to move from the coil to the pan.

Examples of Conduction Cooking Electricity Melting ice in your hand

Heat transfer by convection Heat transfer in fluids A fluid refers to a liquid or a gas Convection is responsible for our weather patterns Using a heater, or radiator, during the winter to warm your house is an example of convection. The air is warmed and moves throughout the house. Heat moving through water when it’s boiling is an example of convection.

Examples of Convection Turning the heater on when it’s cold outside Turning the air conditioning on when it’s hot outside Convection currents in the ocean Weather

Heat transfer by radiation Heat transfer due to electromagnetic waves Heat in the form of radiation comes off of things like campfires. Heat from the sun is transmitted by electromagnetic waves.

Examples of Radiation Solar radiation Sitting near a campfire

Mini Quiz Identify the three types of heat transfer in the illustration below. 2. 1. 3.

Create a poster Choose: convection, conduction or radiation Create a poster that has: An example (Picture) Definition of your heat transfer type Describe example using at least 3 complete sentences and the word you chose.