What's up with the water bottle fountain?
The science experiment water bottle fountain uses the principle of atmospheric pressure.
How to use the atmospheric pressure: When the bottle cap is tightened, the bottle mouth is not connected to the outside world, so the air pressure inside the bottle is less than the air pressure outside the bottle. The air outside the bottle will press the water into the bottle through the small holes, so The water won't leak out. After opening the bottle cap, the bottle mouth is connected to the outside air, and the air pressure inside and outside the bottle is equal. The air presses the water inward from the small hole at the bottom, and presses the water outward from the bottle mouth, so the water can leak out by its own gravity. .
Scientific Experiment Steps of Water Bottle Fountain
Step 1: Fill the plastic bottle with water and tighten the cap.
Step 2: Use thumbtacks to cross a row of holes under the plastic bottle, leaving a few centimeters between the holes.
Step 3: Unscrew the bottle cap and water leaks out from the small hole. Tighten the bottle cap again and the water does not flow out again.
The atmosphere has weight and exerts pressure on us. This is a phenomenon we take for granted or not come as a surprise. However, because it is intangible, colorless and odorless, people often cannot feel it and ignore its existence. In fact, air pressure is an indispensable part of people's lives. The small water bottle fountain experiment is a work that makes atmospheric pressure the protagonist.
Atmospheric pressure refers to the atmospheric pressure acting on a unit area. It is numerically equal to the gravity of a vertical air column extending upward to the upper boundary of the atmosphere per unit area. The international unit is Pascal, or Pa for short. The symbol is Pa. It varies not only with altitude, but also with temperature. Regional differences in air pressure are one of the direct causes of meteorological changes and are also an important variable in weather forecasts.