3 It takes heat to shape glass or to make a cup of tea. ENERGY of HEATIt takes heat to shape glass or to make a cup of tea.
4 Temperature measures how hot or cold something is. Energy moves between objects thathave different temperatures.HEAT is energy that moves betweenobjects of different temperatures.The difference in temperatures makesthe energy move back and forth.
5 Temperature ismeasured indifferent scales.The two scales onthis thermometer areCELSIUSandFAHRENHEIT.
6 Clothing traps heat near our body. Water coming from a shower head is hotter than the air around it.Ice cubes melt as heat transfers to them from the warm air.Heat moves from the burner to the pan, to the water, and then to vapor, to the air.
7 This is dry ice – frozen carbon dioxide. It is about -80 degrees Celsius /-112 degrees Fahrenheit
8 Heat moves from your hand to the snow and the snow melts. on theMOVEHeat moves from your hand to the snow and the snow melts.Your hand feels cold.
9 Heat is CONDUCTED from the soup Soon the spoon feels hot. to the spoon.Soon the spoon feels hot.
10 CONDUCTION Conduction is the transfer or movement of heat between two objectsthat are touching.Conduction can also occur within anobject. Heat moves from inside your bodyto warm your skin.Your feet and hands stay warm becauseheat is moving all around your body.
11 CONVECTION Convection is the transfer of heat within a liquid or a gas.Particles in liquids and gases movemore easily because they are fartherapart.The particles take heat with them.Heat from a campfire warms the airaround it by convection.
12 Hot air rises above the cooler air That’s what keeps a hot-air balloon in the balloon.That’s what keeps a hot-air balloonin flight.
13 Heat is conducted from the burner to the pot and then to the water. Heated water travels up, warmingthe cool water above.Cooler water sinks to the bottom,where it gets heated.The cycle repeats – this is called CONVECTION CURRENT.
14 Heat moves by conduction between solids that are touching. FEELING RADIANTHeat moves by conductionbetween solids that aretouching.Heat moves by convectionthrough gases and liquids.
15 Radiation is the transfer of heat without matter to carry it. Heat can also move asRADIATION.Radiation is the transfer of heat without matter to carry it.Heat leaves one object and goes instantly to another.Standing near a campfireyou feel the warm air, youalso feel the heat throughradiation.
16 Heat from the sun radiates through space and through the atmosphere before it warms your face.
17 Heat radiating from this light keeps these chick eggs warm.
18 RADIATION is the transfer of heat without matter to carry it. Heat leaves one object and istransferred on to the other.Radiation is the most important wayheat can move.
19 Life on Earth needs heat from the sun. But space is a vacuum. How does heat travel through theemptiness of space?by RADIATION!
20 Heat moves through some materials very easily. Heat from an oven moves easily intoa pan. But heat from the pan didnot pass through the oven mitt.
21 A material that allows heat to move through it easily is called a conductor. Many heat conductorsalso conduct electricity well.
30 For the most part, solids are better conductors of heat than liquids orgases are. That’s because theparticles that make up a solid arepacked closely together. They vibrate,but they don’t move apart verymuch. Heat can move quickly formone particle to another.
31 Look carefully at this experiment. What happened? Why?
32 Particles in the hot coffee have higher kinetic energy which transmits heat to the cup and ultimately to the air surrounding the cup.
33 But not all materials are conductors. Heat does not move easily throughsome materials.And it does not move at all throughother materials.Materials that do not conductheat well are calledINSULATORS.
34 Oven mitts are insulators. They are made of materials that are poor conductors of heat. When youremove a pan of cookies from theoven, your hands don’t get burned.
35 Gases can be good insulators. A thin layer of trapped air is an excellentinsulator. In cold weather, layers ofclothing trap your body heat nearyou. There is air between the layersof clothing. Along with the clothing,the air insulates your body.
37 Insulators can be used to slow down the movement of heat. Metal wires conduct electricity and heat.Most wires are covered in rubberto insulate them and keep peoplesafe from the electricity and heat.
38 Most furry animals stay warm in cold weather. Fur is made of thick Hair is an InsulatorMost furry animals stay warm incold weather. Fur is made of thickhairs. Around each hair is air. Theair and the fur act as insulators,keeping the animals warm.
40 A thermos has a glass lining. This glass lining holds the cocoa or soup.Glass is not a good conductor of heat.Energy can even move in a vacuum. Usinga reflective silver surface act like a mirror.It reflects some heat back.There is a vacuum between the inner and outerglass layers of the thermos bottle. The vacuumkeeps conduction or convection from takingplace. Using this system reduces conduction,convection, and radiation.The cocoa stays hot.
41 How can knowledge of insulation help us conserve energy?
42 When the weather is hot, you want to keep heat from coming into your home. When theweather is cold,from leaving your home.It costs money to cooland heat a home.Heat leavingthe home
43 There are different ways to slow the flow of heat into or out of a house.Some things need to be done whilethe house is being built.Others things can be done to anexisting home.Insulating a home saves money.It also helps conserve energy.
44 The number 1 thing that can be done to conserve energy is insulation. Insulation is blown inside the wallsof a house. Insulation keeps heatfrom traveling through to the attic.Insulation keeps heat from escapingthrough the walls.
50 Soil is a great insulator. Basements are usually cool, even in the summer because soil coversthe sides of basement walls.
51 REVIEW insulator conductor conduction convection radiation WORD BANK – WORDS MAY BE USED MORE THAN ONCEinsulator conductor conduction convection radiationHeat moves easily through it: _______________________________Heat does not move easily through it: ________________________Solids often do this to heat: ________________________________A thin layer of trapped air can do this to heat: _________________Which forms of heat transfer do insulated bottles prevent: ____________________________________________________________Wrapping hot water pipes prevent which form of heat transfer: ___ ______________________________________________________
52 WORD BANK - CONDUCTION CONVECTION RADIATION REVIEWWORD BANK - CONDUCTION CONVECTION RADIATIONAdd hot water to bath ____________________________________Space heater ____________________________________________Iron-on decals ___________________________________________Clothes dryer ____________________________________________Sunlight through window _________________________________Sandwich press __________________________________________