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HEAT 3 RD Grade Science Chapter 4. Essential Questions What is heat and how is it measured? How does thermal energy move? How is thermal energy used?

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Presentation on theme: "HEAT 3 RD Grade Science Chapter 4. Essential Questions What is heat and how is it measured? How does thermal energy move? How is thermal energy used?"— Presentation transcript:

1 HEAT 3 RD Grade Science Chapter 4

2 Essential Questions What is heat and how is it measured? How does thermal energy move? How is thermal energy used?

3 Vocabulary Preview Temperature Celsius Thermal energy Heat Conductor Insulator Insulation friction

4 What is temperature? How is it measured? Temperature – how hot or cold something is Temperature can be measured with a thermometer Temperature can be measured on two scales: Fahrenheit Celcius

5 Celsius Scientists usually use the Celsius scale Water boils at 100 degrees C and it freezes at 0 degrees C

6 Thermal Energy and Heat Thermal Energy – the form of energy that moves particles of matter If particles are moving very fast – the temperature is high, and the particles have more energy The movement of thermal energy is called heat Thermal energy flows from hotter to cooler objects

7 Questions: What happens when you heat up a solid – such as an ice cube? What happens when you heat up a liquid?

8 Controlling Thermal Energy in our bodies: Sweating – as the sweat on your skin begin to change into a gas – it carries heat AWAY from your body. This makes you feel cooler. Shivering: If you get too cold – you may shiver. This motion helps warm you up People use sweating and shivering to help control their body temperatures

9 Controlling Temperature: People use a thermostat to control the temperature in a room Heat Air-conditioning

10 How Does Thermal Energy Move? There are 3 ways that thermal energy can move: 1. Thermal energy can move from one particle to another in a solid 2. Thermal energy can travel through space. 3. Particles of a gas or liquid can carry thermal energy from one place to another.

11 Conduction and Conductors Conduction: the movement of thermal energy between objects that touch each other. Example: When you cook food in a pan on the stove, heat moves from the burner to the pan, to the food by conduction.

12 Conductors Conductor: an object that thermal energy can move through easily A pan is used for cooking because it is made of metal – such as iron or copper Thermal energy moves easily through most metals

13 Insulators Insulator – an object that doesnt conduct heat well Example: When you pick up a hot pan, you use a potholder. Wood, cloth, and plastic are good insulators Air is a good insulator too.

14 Insulation Insulation is a material that is used to slow the movement of heat. Insulation may be found in: Walls of your home A thick jacket Thermos or cooler

15 **Thermal energy moves from WARMER objects to COOLER objects In winter, insulation helps keeps warm air inside a home In summer, insulation helps keep hot air from getting into the home

16 How is Thermal Energy Used? Friction – a force between moving objects Friction slows the moving objects and produces heat What are some examples of friction?

17 Ways we use Thermal Energy Sitting by a fire to get worm Taking a warm shower or bath – thermal energy is used to heat the water Solar panels on homes

18 Ways thermal energy can be produced: from electricity mixing of chemicals

19 Vocabulary Review Temperature – the measure of how hot or cold something is Celsius – the metric scale for measuring temperature Thermal energy – the form of energy that moves particles of matter Heat – the movement of thermal energy from hotter to cooler objects Conductor – an object that heat can move through easily

20 Vocab. Review Cont. Conduction – the movement of heat between objects that are touching each other Insulator – an object that doesnt conduct heat well Insulation – material used to slow the movement of heat Friction – a force between two objects that slows the objects and produces heat.

21 Review – Answer the following questions: What is heat and how is it measured? How does thermal energy move? How is thermal energy used?


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