Page 79 - Science Course 1 (Book 2)

Mo8-L6a: What is the Effect of Specif c Heat?

Conduction

When particles with different kinetic energies collide,
the particles with higher kinetic energy transfer energy
to particles with lower kinetic energy.
The transfer of thermal energy between materials by
the collisions of particles is called conduction.

Conduction continues until the thermal energy of all
particles in contact is equal.

Conduction
Energy is transferred by direct contact.

Convection
Energy is transferred by the mass motion of molecules.

Radiation
Energy is transferred by electromagnetic radiation.
The hot air transfers thermal energy to, or heats, the
cool lemonade by conduction.
Radiation
Eventually the kinetic thermal energy and tempera-
The transfer of thermal energy from one material to ture of the air and the lemonade will be equal.
another by electromagnetic waves is called radiation.

Radiation is the only way thermal energy can travel
from the Sun to Earth, because space is a vacuum.

Radiation also transfers thermal energy through
solids, liquids, and gases.

A thermal conductor is a material through which
thermal energy f ows easily.

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