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Heat Transfer

Three Methods of Heat Transfer

Heat always goes from ______________ to __________________. Heat is movement of ________________ from a warmer object to a cooler object.

Radiation

Heat transfer by ______________takes place with ________ direct contact between a heat source of an object.

Heat transfer by electromagnetic _____________. Will transfer through the vacuum of ___________________. Matter is not required. Other familiar forms of radiation include the heat you feel around a _____________ or open fire.

Radiation enables _________________ to warm Earth’s surface.

Conduction

What happens as a spoon heats up in a pot of soup? The heat is _______________ from the hot soup and the pot to the __________________in the spoon. The particles near the bottom of the spoon ______________ faster as they are heated, so they bump

into other particles as they _____________ through the handle of the spoon and pot. Soon the handle will be too hot to hold! Usually associated with solids/ _________________ contact.

Convection

Conduction heats up the spoon, but how does the soup inside the pot heat up? Heat transfer involving the ____________________ of fluids- liquids and gases- it is called convection.

During convection, heat particles of ________________begin to flow transferring heat energy from one ______________________of the fluid to another.

Convection and Density

The ___________________ particles are moving faster, they _________________ out more. So they are ________________dense and _________________. After giving their energy to the cooler fluid at the top, they are now _____________________ and

more ________________. More dense fluids __________________.

Convection Currents Diagram

Convection Currents

The heating and cooling of the fluid, changes in the fluid’s _______________, and the force of gravity combine to place the __________________ in motion.

Convection currents continue as long as heat is ____________, without heat the currents will _______ when all of the material has reached the same temperature. However, heat from the Earth’s ________ and __________causes the currents to form in the asthenosphere.

Key Terms!

Heat Transfer- The _______________ of energy from a warmer object to a cooler object.

Radiation- The ____________ transfer of energy through empty space by electromagnetic waves.

______________- The transfer of heat from one substance to another by direct contact of particles of matter.

Convection- The transfer of heat by movements of a _________________.

________________- The amount in a given space; mass per unit volume.

Convection ________________- The movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another.