Hello, I am Jared, back with another demonstration experiment on the water cycle. We are going to
make it rain inside. That is a cool thing, and it may seem like a lot of materials...
It is very simple, very user friendly, very easy, and we can make it rain inside. We want kids to be able
to see the water cycle work, so I have a pan full of water, I heated it on the burner, I do not know
if you can see the steam coming off. We wanted to speed up the evaporation process, so instead of
the sun heating the water from above, the coil is heating the water from below, making it evaporate.
So, evaporation: easy, but the cool part about evaporation is it cleans and cleanses the water.
So, I want to make this water dirty, I could spit in it, things like that... I am just going to put some
red food coloring, some blue food coloring in... you could put in dirt, you could put in
vinegar, I am going to put some salt in, you can put in sugar, you can see plenty of salt,
and I have a soupy dirty mess in there. I would not want to pick that thing up and chug it down.
It is dirty, but that is what is cool about the water cycle - we can take this mess
and purify it, clean it, we need all the water cycle to do it, so
here we go. All of that liquid in there is starting to evaporate, What I need to do
is - I need to be able to condense that water vapor in this air. How do I do it? Scientifically.
I need something cold, and I need the water to condense onto something, so I have this pan.
How do I make the pan cold? Put some ice in it. So, let us rip the bag open. Let us put some ice in...
The ice is going to melt, form a nice cold layer of water,
now I am going to hold my cloud, my layer of cold air, over this water vapor, and you are going to see
this pan actually start to fog up. What is going on?
Well, as that water vapor is hitting that cold pan it wants to condense back into a liquid,
and it is starting to condense into a liquid, and as more water vapor hits, all of
those tiny droplets of water get bigger and bigger. As more water condenses onto it,
you can actually see it, and we are going to give it some time, but actually enough water is going to
condense on the bottom of this pan. It is going to rain, it is going to precipitate, and the cool thing
is, I am going to lick this pan, it is not going to taste like salt, Why? All the dirt is left down in the
pan. That is the cool thing about the water cycle - it cleans all the water. It is an amazing design,
so to show you that, the water on this pan, we brought in a little light, we are going to angle
the dish, I normally would not do this, but just so you can see the water condensing onto the pan, and
you are going to see it precipitate, so here we go. Let us angle this, try to keep the ice in the pan
and if you see the water dripping down, it is not dripping, it is raining
folks, that is the scientific term. We have water evaporating, hitting the cold air or the cold
pan, condensing onto that. That water droplet gets so heavy that it rains, it precipitates.
The beauty of the water cycle. Thanks for watching.