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Conduction convection radiation

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Karen Konitzer

on 13 October 2010

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Transcript of Conduction convection radiation

Heat transfer conduction convection radiation molecules in solids are tightly packed together and are vibrating What is happening? Fire heats the pot of water from the bottom The hot water at the bottom begins to rise cold water then falls to take the place of the hot As the water heats up, the molecules move faster and further apart. This makes the hot water less dense Heat always rises so it rises The cold water is , so it falls down. more dense BTW this is how hot air balloons work because is it lighter than cold a circular pattern called a is formed convection current Also convection currents in the Earth's mantle cause the land masses to move causing earthquakes and volcanoes because it's molecules are slower and more tightly packed There is nothing between the Earth and the Sun The lack of matter is called a vacuum there are no atoms to bounce against each other because they are so far apart there is nothing but space between these two atoms so how does heat from the sun get to Earth? Heat can travel like light in waves across the vacuum of space Other things radiate heat:
hot metals
your body Can you think of anything else? transfer of heat in waves of energy without needing matter light colors radiate heat dark colors absorb heat Which is why summer fashion has pale colors, and winter has dark. but what happens as they heat up? the moleules at the end start to vibrate faster they hit their neighbor, transfering a bit of their kinetic energy the neighbor hits it's neighbor

thus the transfer of energy down the solid all metals conduct energy Since is the movement of molecules heat There is no such thing as the transfer of COLD! Heat either enters or leaves through a transfer of energy by molecules moving faster (gaining heat)
or molecules moving slower (giving heat away) Therefore always moves from hot to cold heat or from fast molecules to slow molecules their lattice work pattern allows for the easy transfer of energy Not every solid has the ability to conduct energy. things that prevent or slow conduction are called insulators so they are called conductors examples of insulators: Why is this important to you? Can you think of other examples of convection in your life? transfer of energy through a solid energy transfer through liquids and gases How could you use this knowledge? this is called radation
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