Fill the bathtub and climb in. Grab your water bottle and tack and poke several holes into the lower half the water bottle. Fill the bottle with water and cap it. Lift the bottle above the water level in the tub and untwist the cap. Water should come streaming out. Close the cap and the water streams should stop. Open the cap and when the water streams out again, can you “pinch” two streams together using your fingers?
Materials: A tack, and a plastic water bottle with cap, and bathtub
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What’s happening? First, you’re getting clean. Second, you’re playing with pressure again. Watch the water level when you uncap the bottle. As the water streams out, the water level in the bottle moves downward. Notice how the space for air increases in the top of the bottle as the water line moves down. (The air comes in through the mouth of the bottle.) When you cap on the bottle, there’s no place for air to enter the bottle. The water line wants to move down, but since there’s no incoming air to equalize the pressure, the flow of water through the holes stops. Technically speaking, there’s a small decrease in pressure in the air pocket in the top of the bottle and therefore the air outside the bottle has a higher pressure that keeps the water in the bottle. Higher pressure pushes!
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We’ve just upgraded some things on our back end, so let me ask my technician. What kind of device are you viewing it on, and what browser?
I am having the same issue with the video. I have just been browsing around without the kids, but can’t play this video more than once. Haven’t checked others yet.
That’s really strange – you should be able to watch the videos as many times as you want to.
The cap is needed to keep the water from streaming out! 🙂
Every time I try to watch a video on e-camp, it only lets me watch it once. Why is that?
If you put the cap on the water bottle, will that still prevent the streams from coming out?