1. The Transfer of Heat

Professor supervision: Student preparation:
Jasem Mohammed Mustafa Wahib

2. The Goal

Knowledge of heat transfer by
conduction

Knowledge of heat transfer by
pregnancy

Knowledge of heat transfer by
radiation

3. Heat

Heat ALWAYS moves from a warmer object to a
cooler one. This movement is called heat transfer.

As heat moves into an object, it becomes warmer.
As heat moves out of an object, it becomes cooler.

4. Heat Transfer

When a freshly made
cup of coffee is sitting
on a counter, it will lose
heat because the air
around it is cooler than
the coffee.

When an ice cube is
sitting on a table, the
warmth in the air will
transfer into the ice
cube, melting it.

5. Heat Transfer

There are 3 ways that heat can transfer to other
objects. These methods of transfer are called
conduction, radiation, and convection.

6. Conduction

Conduction is the
transfer of heat
between things that are
touching.

When two things that
are touching have
different temperatures,
heat will move from the
warmer object to the
cooler one.
Examples:
• Hands are warmed when
holding a hot mug of cocoa
• A hot stove burner warms a
pot sitting on it.

7. Conductors

Conductors are objects that allow
heat to move through them easily.

Metals are good conductors
because they allow heat to move
through them easily. Examples of
metals include iron, silver, copper,
aluminum, and stainless steel.

For example, if you were at a
campfire and you put a stick in the
fire, your hand would not burn.
Wood is not a good conductor. If
you left a metal spoon in a hot pot
on the stove and held the spoon,
your hand would burn.

8. Convection

Convection is the
transfer of thermal
energy through liquids
or gases.

Warmer air and water
rises and cooler air and
water sinks. This creates
a convection current.
Click the picture below
for a convection
demonstration.

9. Radiation

Radiation is the transfer of energy through
electromagnetic waves.

Radiation from the sun heats objects on Earth.
Heat travels from fire to objects through radiation
as well.

10. Thanks