 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is the flushing toilet myth, the Coriolis Effect. Do toilets flush different ways in the northern hemisphere and the southern hemisphere? As always, adult supervision is required. What you need for this experiment is a toilet and a tub or sink in the northern hemisphere and the southern hemisphere. So the question was how do I do this since I live in California in the northern hemisphere? Well, I contacted a very nice gentleman from StemShare and he was nice enough to do the second half of my experiment. So I thank Andrew very much. You guys please look at his information in the description below because he was of a huge help as I did not have a toilet or sink in the southern hemisphere. So special thanks to Andrew and StemShare. So we're starting with Andrew's video in the southern hemisphere with the toilet test and just flushing it. So by now everyone's heard about the myth that if you live in the southern hemisphere that the toilets will spin one way and the northern hemisphere the other way. And basically it's because of the Coriolis Effect, right? So Andrew's doing this in the southern hemisphere and we're flushing it, but it's just a myth. So it's basically as you'll see in these videos in the next 20 seconds or so it's the way the jets are pushing the water out on the sides dictates on how the water is going to go down the toilet. So you could have in the same hemisphere toilets go different directions because the jets are pushing that water that direction. So we'll see another time here with us. This is time in my and northern hemisphere in California. We flush it and we can see the water comes at a different angle. It looks like it's going counterclockwise. But once again, because of the rotation of the waters being pushed out by the jets, it makes it impossible to be able to figure out if the Coriolis Effect is doing its job. So we'll have to go back to different experiments to see how we're going to be able to see this work. Here I have a couple of satellite images showing the Coriolis Effect. Here is in the northern hemisphere. Weather forecasters use the Coriolis Effect as part of their calculations to work out how airflow moves from areas from high pressure to low pressure. The air wants to move in a straight line from high to low. But thanks to the Coriolis Effect, the air is deflected to the right in the northern hemisphere as we see here and it moves to the low pressure zone counterclockwise. And then we'll see when we go into the southern hemisphere over Australia, it's going from low area to the clockwise direction. So the high pressure tries to push it to the middle because of the Coriolis Effect. It's rushing the air deflects off course and by the low pressure in the middle. So the northern hemisphere gets pulled slightly to the right and the air keeps trying to get to the middle but it continues to spin counterclockwise to the right motion. The southern hemisphere is pulled to the left making it spin clockwise. So the Coriolis Effect really works in large distances. It's very hard to make it work in a small scale like a sink or tub but we are able to do that and we're going to show you that now. So the first attempt Andrew in southern hemisphere in Australia put the water in and basically waited about an hour and you see when he drops the food coloring, it starts to go counterclockwise. And that's partly because the water hasn't settled, it's still spinning around. So I asked Andrew to do another test and actually let the water sit in the tub for 24 hours. Therefore it would settle down and the water wouldn't be moving in a circular motion. So here we are, Andrew's doing a second test, 24 hours the water has been sitting there and he's going to let it out and he's going to put some food coloring in. And he starts to put it in and it's a little hard to see it first but we can start to see it's starting to go clockwise. You'll watch the next drop or two, here it goes, you can see it moving clockwise in that direction. So it is a success which is supposed to be pretty hard to do in a tub or a sink but we're able to do it. So great job, thank you Andrew and it seemed like waiting that extra time to let the water stop circling around in the circle and it did the correct effect. Alright so we're in my neck of the woods, northern hemisphere California and I put my dye in the sink and you can see it's working. It's going counterclockwise direction in the northern hemisphere so the Coriolis effect is working in the sink. And I owe a special thanks to Andrew and STEMshare making this possible to be able to have two different people, don't even know each other, get together and make this experiment. So thank you so much, remember to share and to subscribe and thanks for watching.