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Copy of Thermal Energy

Definition, difference between Heat and Thermal Energy, Methods of Heat Transfer.

Justan Vance

on 4 September 2013

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Transcript of Copy of Thermal Energy

Thermal Energy
Heat Transfer
The total Kinetic Energy of all the moving particles of a substance.
The more total Kinetic Energy a substance has, the more Thermal Energy it has.
More K.E.
Less K.E.
A lake filled with freezing cold water has more thermal energy than a hot cup of tea.
Thermography is the use of an infrared camera to "see"
the thermal energy given off by an object.
Heat is the transfer of thermal energy from one object to another because of a temperature difference.
Heat always travels from warmer substances to cooler ones.
Why do things feel Hot or Cold?

When you touch something with more thermal energy than your hand...heat flows to your hand from the object. This extra thermal energy feels hot.

When you touch something with less thermal energy than your hand...heat flows from your hand to the object. The loss of thermal energy feels cold.
Insulators: Substances that do not transfer heat well
What other Insulators can you think of?
WHat are their uses?
Thermal Expansion: when a
substance is heated it gains
Thermal Energy and expands.
Conduction is the transfer of heat energy from one object to another by direct contact.
It is the transfer of heat energy from atom to atom within a substance.
What do you think would happen in the diagrams below?
Only occurs in fluids (gases OR liquids)
Convection is the transfer of heat energy in a gas or liquid by movement of currents.
The transfer of heat in the form of waves through space. Dull black surfaces are better than white at absorbing radiated heat.
Thermal Energy
Just think of it! The sun transfers heat through 93 million miles of space. Because there are no solids (like a huge spoon) touching the sun and our planet, conduction is not responsible for bringing heat to Earth. Since there are no fluids (like air and water) in space, convection is not responsible for transferring the heat. Thus, radiation brings heat to our planet.
Because it has a trillion times the number of particles. So, all of the kinetic energy from all of those particles adds up to much more motion than the particles in the cup of tea.
Grab the metal leg of your chair. What does it feel like? Why?

Touch your face with the same hand-what does it feel like?
1. The diagram below shows a Bunsen burner
heating a beaker of water on a beaker stand.
The arrows represent the transfer of heat energy
in the water.
Which process is primarily responsible for the transfer of heat indicated by the arrows in the beaker of water?

(1) conduction (3) radiation
(2) convection (4) condensation
2. Energy from the Sun reaches Earth mainly by the process of

(1) conduction (3) reflection
(2) convection (4) radiation
4. A material that allows heat to travel through it is called:
A) conductorB) convectorC) insulatorD) heater
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