Heat Transfer

Heat Transfer

Standard

SC.7.P.11.4 Observe and describe that heat flows in predictable ways coming from warmer objects to cooler ones until they reach the same temperature

REMINDER

Heat will travel from an area of high temperature to an area of low temperature (but never the other way around)

Radiation

• The transfer of energy by electromagnetic waves.

• Radiation is absorbed by matter and converted to heat energy.

• Does not always require matter in order to move.

Convection

• the transfer of thermal energy (heat) through the movement of liquids and gases.

• Convection occurs in FLUIDS (liquids and gases).

• Convection produces CURRENTS in both gases and liquids.

Conduction

• the transfer of heat from one object to another through direct contact (touching) of matter.

• •Conduction occurs primarily in solids because the particles are tightly packed together.

• •The particles themselves DO NOT move, heat energy does.

Multiple Choice

Check For Understanding:

How does heat travel?

• from hot to cold

• from cold to hot

• it does not travel

• it only travels when it's hot

Review Questions

Let's Review

Multiple Choice

Jesse is walking on the sand at the beach one summer day. If heat is not flowing between her feet and the sand, which of the following must be true?

• The sand is wet.

• The sand is too cold for heat to flow.

• The sand is the same temperature as her feet.

• There is no friction between her feet and the sand.

Multiple Choice

Jeffery brings a book from air-conditioned apartment to a balcony on a hot summer day. How will the cool book interact with the outside air?

• Heat from the book will move to the air.

• Heat from the air will move to the book.

• Coolness from the book will move to the air.

• Coolness from the air will move to the book.