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Heat can travel by Convection A hot fluid expands, so is less dense, so rises. Cold fluid takes its place. A convection current can be formed.
Examples of Convection
Heat cannot travel in solids by convection. Why ?
Heat can travel by Conduction Hot particles vibrate more, so collide with adjacent particles. The heat energy travels from hot to cooler areas. hot cold
Heat can travel by Conduction Metals are good conductors of heat Why ?
Heat can travel by Conduction Metals are good conductors of heat They have free electrons that can move from atom to atom carrying thermal energy too
Heat can travel by Conduction Most gases are poor conductors of heat (insulators) Why ?
Heat can travel by Conduction Gases are poor conductors of heat (insulators) The atoms are too far apart for the vibrations to be passed easily.
There’s one other way! ¡Uno mas!
Heat can travel by infrared radiation (“Hot light”!)
Infrared radiation Infrared radiation can travel through a vacuum (and through air)
An experiment! Can you gather again around Mr Porter?
Infrared radiation Black objects are good absorbers of infrared radiation.
Infrared radiation Shiny objects reflect infrared radiation. Nottingham Forest winning the champions league in 1979
Infrared radiation Black objects are good EMITTERS of IR radiation 100°C Shiny!
Vacuum Flask (“Thermos”)
The insulated lid stops the heat escaping (and entering) by convection
The vacuum between the two walls stops the heat escaping (and entering) by conduction vacuum
The silvered inner and outer stops the heat escaping (and entering) by radiation silvered outer silvered inner
This means hot liquids stay hot because the heat cannot escape Hot chocolate
This means cold liquids stay cold because the heat cannot enter Cold Vimto
In reality, some heat escapes via the lid and eventually the liquid inside will become the same temperature as the surroundings
In a perfect flask without a lid, a hot drink would stay hot forever! Hot chocolate
The vacuum flask Can you complete the sheet please?
Other methods of insulation? Can you think of FIVE other examples of heat insulation? Draw a diagram for each one and two sentences of explanation explaining how it works.
Do now! He’s going to blow! Be careful Good Neutral Excellent MOODOMETER Can you finish the sheet you started on Friday (“Testing insulation 1”)?
Do now! Can you finish the questions you started last lesson?
Today’s lesson Heat transfer If you’re waiting you can finish your “convection” mind map.
Thermal effects - Do now! Make a list of good and bad conductors of heat.
Types of Energy HeatChemical LightGravitational SoundElastic/strain KineticNuclear Electric.
Methods of Heat Transfer. List as many Methods of Heat Transfer.
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© Boardworks Ltd of 32 Heat energy only flows when there is a temperature difference from a warmer area to a cooler area. Why does heat transfer.
Heating & Cooling. Introduction to Heating & Cooling.
Conduction Conduction is the transfer of thermal energy through matter by the direct contact of particles. Conduction occurs because all matter is made.
Transfer of heat Heat is a form of energy. It always flows from one place to another, that is from hot to cold places. Heat flows in 3 ways: 1) Conduction.
Heat Transfer Conduction, Convection, and Radiation.
© Boardworks Ltd of 32. © Boardworks Ltd of 32.
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Thermos Grade 8. A thermos flask is used to keep hot ( or cold drinks)
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Conduction Conduction is the transfer of thermal energy by collisions between particles in matter. Conduction occurs because particles in matter are in.
Conduction Thermal energy is transferred from place to place by conduction, convection, and radiation. Conduction is the transfer of thermal energy by.
What is Heat? This is the movement of thermal energy from a substance at a higher temperature to another at a lower temperature.
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THERMAL ENERGY AND HEAT SPH4C April THERMAL ENERGY James Prescott Joule ( ) spent much of his honeymoon studying waterfalls. He noticed.
Conduction CONDUCTION is when heat moves through a ________. Metals are better conductors of heat than plastic or wood. This is why… These parts are made.
Section 2: Transferring Thermal Energy Chapter 6: Thermal Energy.
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S2 Revision Heat. Temperature Temperature is a measure of the hotness or coldness of something and is measured in ˚C. There are three different ways that.
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What is heat? answer A form of energy.
Heat Heat is thermal energy that flows from something at a higher temperature to something at a lower temperature. 6.2 The Nature of Heat Heat is a form.
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