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.
