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Hello, I'm Jared, back with another demonstration experiment on the water
cycle.
And this is pretty cool, we're going to do the water cycle in a baggie. We're
gonna make it rain
inside this bag. Really cool.
So the shorter baggies can work, but I find the bigger baggies, the Ziploc baggies, are
the best. You want a nice clean seal
and you want some space for that water cycle to happen-that evaporation,
condensation, precipitation
and accumulation-to happen. So I'm gonna draw a design
on this and I'm just using a Sharpie marker so it doesn't come off.
I'm gonna draw a sun because that's what powers it. A
nice smiley face sun, it's beautiful.
I can draw some clouds if I want to, I could draw
some ocean waves, really simple design-
now let's make the water happen. So I'm gonna open the baggie,
fill it just a little bit with water trying to keep it off the edges as much
as possible.
You can see that's all the water I want. It's going to actually be hanging on the
window,
so if it's heavy it might actually fall down. Now, you can keep the water in clear,
but I find it's really neat if you add food coloring.
Because that's where the magic happens; when the water evaporates and condenses on
the side.
It's cool to get kids to hypothesize what color that water is gonna be.
So be careful it doesn't splash up on the sides. Just put a few drops of food coloring
in, you can make it is dark or as light as you want.
And I wanna seal this up.
Make sure it's not open or else the evaporating water will get out of the baggie.
So let's hang this on the window and see it in action. Okay, here we are back in
Jared's classroom. As you can see we have a number of these bags just taped up
with masking tape on a window,
and it's really fun for the kids to watch them during the day.
Um, this is a sunny day so already the evaporation is occurring
and we have water droplets on the side of the bags.
One of the things that's really interesting to note, the blue water-
only the water-is evaporating, so the water droplets themselves are clear.
You could ask the kids to hypothesize why that is.
So now we're going to zoom in on one of the bags here with the smiley face on,
and we're going to see if we can make it rain in the bag. We're just gonna tap
gently
on the bag to see if a few of those drops that are on the side will kind of
get together and fall down. But using the water cycle in a bag is really a fun way
for kids to see the water cycle in action, to really understand it. We're tapping
there,and you could see a little bit starting to rain
inside the baggie. Water cycle in a bag. Thanks for watching.