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HEAT ENERGY - HEAT ENERGY HEAT What is HEAT Form of energy...

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HEAT ENERGY HEAT ENERGY What is HEAT? Form of energy and measured in JOULES Particles move about more and take up more room if heated – this is why things expand if heated It is also why substances change from: solids liquids gases when heated Visit www.worldofteaching.com for more free powerpoints
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Heat and Temperature Heat and Temperature The temperature of an object tells us how HOT it is Measured in degrees Celsius - °C It is NOT the same as heat energy although the two quantities are related. e.g. a beaker of water at 60 °C is hotter than a bath of water at 40 °C BUT the bath contains more joules of heat energy
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Heating and Cooling Heating and Cooling If an object has become hotter , it means that it has gained heat energy. If an object cools down , it means it has lost energy
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Heating and Cooling cont… Heating and Cooling cont… Heat energy always moves from: HOT object COOLER object e.g.Cup of water at 20 °C in a room at 30°C - gains heat energy and heats up – its temperature rises Cup of water at 20 °C in a room at 10°C loses heat energy and cools down – its temperature will fall.
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HEAT ENERGY HEAT ENERGY Energy transfer Conduction Convection Radiation
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Conduction
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