Heat is more than hot or cold
ENERGY TRANSFER from a higher temperature to a lower
Energy in the form of heat always flows from HOT to cold.
Activity: Look at the picture,
in your notebook draw the
from the higher temperature
the lower temperature object.
Textbook page 126, exercise #7
Draw an arrow to show the direction of energy
Remember, energy flows from HOT to Cold
One way of measuring heat is the calorie (cal).
* In nutrition, 1 C (a Kilocalorie) is equal to 1000
One calorie (cal) is equal to the amount of energy
needed to raise the temperature of 1 g of water by
Heat is energy flow.
Thermal Energy is the total Kinetic Energy of a
Temperature is the average Kinetic Energy of a
Beaker A = 85oC
Beaker B = 15oC
Beaker A has a higher temperature. 85oC
Heat will transfer from Beaker A to Beaker B (by conduction
using the metal wire).
Heat will transfer until both beakers are the same temperature.
Beaker B will have MORE THERMAL energy because it has
How do you touch hot food or other hot items?
Write down materials you use to touch hot items
without burning yourself:
Conductors and Insulators
Insulators are materials that are poor conductors
of heat. These keep objects hot (or cold), but not your
Examples: wood, plastic foam, paper
Conductors are materials that transfer heat very
These objects will transfer heat fast from the object to
There are 3 types
(Conduction, Convection, Radiation)
HEAT is the flow of energy from a higher
temperature object to a lower temperature object.
VIDEO please click to listen and watch an online
Prezi about the 3 types of Heat Transfer.
**Can you explain the last picture in the
Heat Transfer 1: Convection
Click the above link to see Convection of a gas.
Convection also works for liquids! click for the video!
Add Energy (in the form of heat from a higher
temperature object). The particles of a substance (gas
or liquid) will move faster and spread apart, which
makes them less dense. They will rise up. They have
more kinetic energy.
When they begin to cool, the particles move slower and
move closer together, which makes them denser. They
Heat Transfer 2: Conduction
When a higher temperature object is in contact
(touching) a lower temperature object, heat will flow
from the hotter object to the cooler object.
This is Conduction!
In the photo to the left,
which letter demonstrates
A: The burner is in contact
with the kettle and the flame.
This is a polar bear hair.
There is air in the middle. This is a good insulator.
This helps to keep the bear warm.
Heat Transfer 3; Radiation
Radiation is heat transfer through electromagnetic
There is no direct contact (touching) between the
higher temperature object and the lower
An example is the SUN. It warms the earth through
Summary of Heat Transfer:
Convection of liquid
What is the difference between an insulator and a
A conductor has particles that transfer heat quickly.
conductor? has particles that do not transfer heat quickly.
What Heatis used to measure heat?
unit is measured in calories (cal).
If a substance No it may not. It has to have many molecules. Tempera
has a higher temperature, does it
is the average kinetic energy of a substance. Thermal E
also have greater kinetic energy of a substance.
List 3 types of Heat Transfer.
Conduction, Convection, and R
When two objects of different temperatures are in
contact, which conduction. Conduction demonstrate?
This demonstrates heat transfer does this transfers heat by two
After a period of time, the temperatures of both objects will be th