Conduction, Convection, Radiation

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Presentation transcript:

Conduction, Convection, Radiation Thermochemistry Conduction, Convection, Radiation

Energy Transformations “Thermochemistry” - concerned with heat changes that occur during chemical reactions Energy - capacity for doing work or supplying heat weightless, odorless, tasteless if within the chemical substances- called chemical potential energy

Energy Transformations Gasoline contains a significant amount of chemical potential energy Heat - represented by “q”, is energy that transfers from one object to another, because of a temperature difference between them. only changes can be detected! flows from warmer  cooler object

3 types of Heat Transfer

Conduction Conduction – heat transferred by particles colliding into one another, such as in a metal. Transfer of energy by touch Not an effective transfer in a gas. Primarily solids Used for cooking on stove tops.

Convection Convection – heat transferred by the circulation of a fluid (or gas), such as in a heating system at home; important near the surface of the Sun. Hot air rises cool air falls Used for baking in ovens.

Radiation Radiation – heat transferred by the flow of electromagnetic radiation, like heat felt from the campfire. Radiation is the only type of heat transfer that can happen in a vacuum. Heat transfer through waves