Hello, I am Jared. Welcome to FunScienceDemos. The big idea today is that different types of
matter allow heat energy to move through them at different speeds. Take a look at this pot - what is
the purpose of the pot? It heats things up. Heat energy travels through it. I said different types
of matter allows heat energy to move through them at different speeds, well this pot has two
different types of matter, the top part is steel, the bottom part is copper. Why is the copper on
the bottom? Why not reverse it? Sounds like I need science to answer that question. Now, I
can not see heat energy moving through matter. I can not see the heat energy moving through this
pan, but using science, we can show you how quickly that heat energy moves. Using this
demonstration, I have two candles that are going to provide our heat energy, and we have our two
different types of matter - we have a copper rod and a steel rod, clothes pins and a little stand,
we have our timer, but what are these pink dots? Well, we needed something to show you
the heat energy moving down the rods, so we took wax from a birthday candle and put little drips
along our rod. As the heat energy moves down the rods, it melts the wax, and we should be
able to see the heat energy moving down the rod, and how quickly they are moving down, how
quickly that heat energy is moving down each rod. Is it moving more quickly down this rod,
or is it moving more quickly down this rod? Let us take a look - our candles are lit and
we are ready for our race to begin. I am going to slide these candles under our rods providing the
heat energy, and I want you to watch carefully to see how quickly that heat energy is moving down
the rods. Once I slide the candles under, I will start the clock, and the race begins. Here we go,
so the flames are starting to provide heat energy, and that heat energy wants to move. It wants
to move down our rods, and it does not look like anything is happening. It does not look too exciting
at all, because you can not see it, but once that heat energy gets to these first two drops, they are going
to start to melt. If you look very carefully at each of these dots, you will see the bottom starting
to melt on each one. It looks like the copper is melting a little bit more than the steel.
Oh, if I look carefully at the copper, I can almost see the second dot of wax
starting to melt a little bit. Nothing is happening on my steel. Both dots are starting to melt,
that means the heat energies travel. Oh, the copper went down first, wait a second, it must mean the
heat energy is moving a little more quickly through the copper. This is starting to melt,
now the race is heating up. The second tie on the copper is starting to melt, it is almost ready to go.
I have the first dot on my steel. That is melted, but the second dot is not melting at
That heat energy is moving more quickly down this copper, I can see it with my eyes. Take a
look at our second dot on the steel, no melting. It is moving more slowly - the second dot on the
copper is ready to go. Oh wow, take a look, I move over, the fourth dot on the copper is actually
starting to melt. Now, we have one, two, three, four dots on the copper starting to melt, only one
dot on the steel, the second dot has not even started to melt. the second dot, look at the
dot on the copper! It is down. My third dot on the copper is ready to melt, my fourth dot, my
fifth dot is starting to melt on the copper. We can see the heat energy moving down the copper.
It is not even moving down the steel. Well, it is, but it is moving slowly. We are at three minutes,
and I am almost melting my third dot. My second dot has not even started to melt on my steel.
Third - that is getting ready to go, ah it goes down let us hit the stop. Let us
blow out the candles, and let us take a look at what happened. You can see one, two, three,
wax dots melted on the copper but only one melted on the steel why that heat energy was moving much
more quickly down the copper, the heat energy was moving much more slowly down the steel. So, why is
the copper on the bottom part of the pot? Through science we have discovered that different types of ,
matter allow heat energy to move through them at different speeds. Scientists call
that conduction, and our demonstration shows us that the copper allows the heat energy to move
through it more quickly. Science is so cool, so it makes sense that copper goes on the bottom, and
the steel is up at the top but what about the handle? Well, some matter conducts heat energy
really well, some matter does not. This handle does not really conduct heat energy all that
well. Do not forget to check out our links in our video description. Thanks for watching.