Magic-looking Science Experiment: A Screen That Holds Water

Magic-looking Science Experiment: A Screen That Holds Water


Last week we did a fun demonstration
called the gravity-defying lid. And this week, we’re going to be doing something
with screens. So you can see that this cup here has a screen over the top.
It’s just a piece of mesh fabric, and it has lots of small little holes that are the
same size. Because of all those holes, I can pour water in and out of the cup,
and the water passes through almost as if the screen isn’t there. Well, something
pretty amazing happens if we put a plastic lid or a piece of cardboard
over the cup, and then turn it upside down and take away the lid.
The water is staying, and it’s staying because water has incredible surface
tension, and incredible cohesion. It really likes to stay together. Last week,
when we did the gravity-defying lid experiment, you could see that it was
possible for me to shake the cup, and the water would stay inside the cup. But with
a screen, and the water itself being the barrier, instead of a plastic lid being the
barrier, it’s not quite the same. Because if I shake this cup, it starts
to leak. And if I tip it to the side, all the water rushes out. I’ve colored this water
green so that you can see it a little bit better, but the water does not need to be
colored. Any type of water will work. This is a really neat demonstration, but it is
not a science experiment because we are not changing anything and we are not
measuring anything. You could make it a science experiment by trying out
different types of liquids, or by changing the size of the holes in the screen. Two materials that might be easy for you to
find are a window screen, which has relatively large holes, and a nylon stocking, which has
relatively small holes. If I fill these both up and turn them upside down, you can see that
the water behaves differently because the size of the holes is different. I can
tip one of them farther than the other, before the water falls out. There are a
lot of fun things you can discover while doing this experiment, such as what
happens if you swirl the water, and get it moving quickly instead of just
standing still. I hope you enjoyed this science demonstration. As always, don’t
forget to check back next Wednesday for our next science activity. And
check the link in the description to download your own Science Fair Guide,
where we give you step-by-step instructions on how you can turn this
demonstration into full science experiments, where you can gather data and
discover new things. I want to give a special thank you to this month’s
Navigator Patron, Noelani Nomiyama If you would like to support the
creation of these videos, check us out at patreon.com/ScienceMom

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About the Author: John Markowski

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