What's with the water bottle fountain?

The scientific experiment water bottle fountain is based on the principle of atmospheric pressure.

Usage of atmospheric pressure: When the bottle cap is tightened, the bottle mouth is not communicated with the outside, and the air pressure inside the bottle is less than that outside the bottle. The air outside the bottle will force water into the bottle through the small hole, so that water will not leak out. After the bottle cap is opened, the bottle mouth is communicated with the outside air, and the air pressure inside and outside the bottle is equal. Air pushes the water pressure in through the small hole at the bottom and out through the bottle mouth, so that the water can leak out by its own gravity.

Scientific experimental steps of water bottle fountain

Step 1: Fill the plastic bottle with water and tighten the cap.

Step 2: Draw a row of holes under the plastic bottle with thumbtacks, and the holes should be separated by several centimeters.

Step 3: unscrew the bottle cap, water leaks out from the small hole, and then tighten the bottle cap, so that water does not flow out.

It is a common or not surprising phenomenon that the atmosphere has weight and pressure on us. But because it is invisible, colorless and tasteless, people often don't feel it and ignore its existence. In fact, atmospheric pressure is an indispensable part of people's lives. The small experiment of Aquarius Fountain is a work featuring atmospheric pressure.

Air pressure refers to the atmospheric pressure acting on the unit area, which is numerically equal to the gravity of the vertical air column extending upward to the upper limit of the atmosphere. The international system unit is Pascal, abbreviated as Pa, and the symbol is PA. It varies not only with height, but also with temperature. The regional difference of atmospheric pressure is one of the direct causes of meteorological change and an important variable of weather forecast.