1 What is heat? answer A form of energy.
A scale used to measure heat energy (how hot or cold something is). answer 2 What is temperature
What would you use to measure how hot or cold something is? What is the unit of measurement? A thermometer The unit is Degrees Celcius ( o C) answer 3
Physical StateMethod of Heat Transfer Solid Liquid Gas Complete the table to show the type of heat transfer for each physical state? Conduction Convection answer 4
What type of heat transfer is being described? Conduction answer 5 The end particle (1) gets hot, vibrates and passes some of its heat to the next particle (2) The end particle (1) gets hot, vibrates and passes some of its heat to the next particle (2) This particle (2) becomes hot, vibrates and passes some of its heat to the next particle (3) This particle (2) becomes hot, vibrates and passes some of its heat to the next particle (3) This process is carried along the line of particles This process is carried along the line of particles 12345
What type of heat transfer is shown here? answer 6 Convection (of liquids)
Why does smoke from the wooden taper get drawn into the box and then out of the chimney? Convection (of gases) answer 7
What is convection? answer 8 A type of heat transfer where hot particles rise and cold particles fall.
What do you call a material that allows heat to pass through it easily? Conductor answer 9
10 answer Insulator What do you call a material that DOES NOT allow heat to pass through it easily?
11 answer The copper will melt the wax first because it is the best conductor of heat Which type of metal will melt the wax first? Why? Copper Brass Mild steel Stainless steel Hot Water
12 answer How is heat transfer used to boil water in this kettle? CONVECTION (The element heats the water at the bottom. The hot water is less dense and rises up The cold water is more dense and falls down to the bottom and meets the element This goes on in a cycle until the water is boiling)
Metal Wood Polystyrene Heater answer 13 Who will get hot first? Ouch!! The metal is the best conductor of heat. The wood and polystyrene are good insulators The metal is the best conductor of heat. The wood and polystyrene are good insulators
How does double glazing cut down on heat loss? The air gap is too small to allow the air to circulate. This prevents heat loss by convection The trapped air is a very poor conductor which reduces heat loss through the window. answer 14
How does a quilt stop you getting cold at night? Air is trapped between the layers of material. This cuts down on heat loss through conduction through solids answer 15
How does heat get transferred through space? Radiation answer 16
In straight lines answer 17 What direction does radiation travel in?
Which of the three covered flasks of hot water will cool down quickest? Why? answer 18 Shiny SilverFurDull Black The black one, because black is the best radiator of heat. The black one, because black is the best radiator of heat.
Two test tubes have 10ml of water and the same starting temperature. Which test tube will show the greatest temperature increase The dull, dark surface heats up quicker, it is a good absorber of heat The shiny silver surface heats up slowly, it is a poor absorber of heat answer 19 Light Bulb Silver coating Black coating
Two test tubes are filled with 10ml of boiling water. Which test tube will show the greatest temperature decrease The dull, dark surface cools down quicker, it is a good radiator of heat The light, shiny surface cools down slowly, it is a poor radiator of heat answer 20 Silver coating Black coating
What type of heat transfer do these images show? answer 21 Infra-red radiation Infra-red radiation
What type of heat transfer is an electromagnetic wave? Infra - red answer 22
When are hot objects losing heat energy? All the time! answer 23
How can we cut down on heat loss in the home? answer 24 Loft insulation Cavity Wall insulation Double glazing Draught excluders Shut curtains
Why is polystyrene a good heat insulator? Air is trapped in the bubbles of plastic. This cuts down on heat loss through conduction through solids answer 25