This simple challenge is harder than you think!
It’s really hard to get that ball in the bottle. To understand why, we’ll have to think about what’s happening to move the ball.
When you blow on the paper ball, you’re not just giving it a push. Instead, it’s more like you’re making a gust of air, and the ball is coming along for the ride.
When you try to blow air into the bottle, there’s a bit of a problem. The bottle is already full of air, and the only way out is through the mouth. Since the ball is quite wide, there’s not enough room for air to go in and out of the bottle at the same time. Instead of going into the bottle, your breath goes around and the ball stops right at the mouth of the bottle.
There are still ways to get the ball in. A short, sharp gust of breath can get the ball rolling, and if it’s moving fast enough and there’s no breath blowing around, the ball should be heavy enough to push a ball-sized amount of air out of the bottle.
Using a smaller ball also helps. A smaller ball means there is more space around the ball for air to come out of the bottle. With a very small ball and a tight stream of air from your mouth, it’s possible to get the ball into the bottle!
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