# Temperature and Heat Transfer - PowerPoint PPT Presentation

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Temperature and Heat Transfer. Food and Cooking Unit Mrs. Caldwell’s Class. Temperature. Temperature is the measure of the kinetic energy of all particles in an object. Remember that kinetic energy is the energy of motion and that all atoms are constantly in motion. .

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Temperature and Heat Transfer

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## Temperature and Heat Transfer

Food and Cooking Unit

Mrs. Caldwell’s Class

### Temperature

• Temperature is the measure of the kinetic energy of all particles in an object.

• Remember that kinetic energy is the energy of motion and that all atoms are constantly in motion.

### Examples of Temperature

• If a liquid has a high temperature, the particles in the liquid are moving fast and have high average kinetic energy.

• If a liquid has a low temperature the particles in the liquid are moving more slowly and have a low average kinetic energy.

Low Average Kinetic Energy = Low Temperature

High Average Kinetic Energy = High Temperature

### Measuring Temperature

• Temperature is measured in degrees.

• The temperature scale used in science is the Celsius scale.

• Water freezes at 0 degrees Celsius.

• Water boils at 100 degrees Celsius.

• A thermometer is used to measure temperature.

Heat – the flow of energy from an object at a warmer temperature to an object at a cooler temperature.

### The Transfer of Heat Energy

• Conduction – the process that moves energy from one object to another when they are touching physically.

• Conductors – materials that transfer energy easily.

• Example: Metals

• Insulators – poor conductors.

• Example: Foam Cup

### The Transfer of Heat Energy

• Convection – the process that transfers energy by the movement of large numbers of particle in the same direction within a liquid or a gas.

• Example: warm and cold air in the atmosphere.

### The Transfer of Heat Energy

• Radiation – energy that ravels as electromagnetic waves, which include visible light, microwaves and infrared light.

• Example: Microwave Oven

### Questions

• What is temperature?

• What happens when a liquid is hot? Cold?

• How is heat transfer demonstrated when you cook?

• Will cold or hot water boil first?

• What are the three ways that heat energy is transferred?

• Name one example of a conductor and one example of an insulator.