The science experiment water bottle fountain uses the principle of atmospheric pressure.
How to use air pressure: When the bottle cap is tightened, the bottle neck is not connected to the outside world, so the air pressure to the inside the bottle is lower than the air pressure outside. The bottle and the air outside the bottle will push the water into the bottle through the small holes. There is internal pressure, so water cannot escape. After opening the bottle cap, the bottle neck is connected to the outside air, and the air pressure inside and outside the bottle is equal. The air pushes the water in from the small hole at the bottom and pushes the water out of the bottle. mouth, so the water can flow out under its own gravity.
Steps of the fo science experimentWater bottle holder
Step 1: Fill the plastic bottle with water and tighten the cap.
Step 2: Use thumbtacks to poke through a row of holes under the plastic bottle, leaving a few inches between the holes.
Step 3: Unscrew the bottle cap and water will flow out of the small hole. Tighten the bottle cap and the water will no longer flow.
The atmosphere has weight and exerts pressure on us. It’s a phenomenon we either take for granted or come as no surprise. However, because it is intangible, colorless and odorless, people often cannot smell it and are unaware of 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 column of air extending upward to the upper limit of the atmosphere per unit area. The international unit is Pascal. , or Pa for short, the symbol is Pa. This varies not only with altitude, but also with temperature. Regional differences in atmospheric pressure are one of the direct causes of weather changes and are also an important variable in weather forecasting.
Small physics experiment/learn about the principle of this experiment and explain it
Small science experiments that third graders can perform include: triboelectricity, garlic germination experiment, unbreakable paper experiment, ice fishing, bouncing eggs, unwet paper, toothpick speedboat, rainbow bridge, angry bottle.
Experiment 1: Bouncing Bubbles
Experimental principle: The bubbles in stage 1 are prone to explosion due to water evaporation. After adding glue, they will become very sticky and the water will become very sticky. cannot be easily removed. As it evaporates, the resistance of the bubble wrap increases so it can jump onto the back of our hands.
Experiment 2: Automatic rise of water
Experimental principle: When the candle is extinguished, the water in the glass rises gradually and stops after reaching a certain level . Because the candle burns, it consumes the oxygen in the glass and the reduced oxygen is filled with water.
Experiment 3: Color changes
Experimental principle: Purple cabbage contains anthocyanins. When it encounters substances of different acidity and alkalinity, a chemical reaction occurs, so that it changes color overall. , it appears red when it encounters substancesacidic substances, blue when it encounters alkaline substances and purple when it encounters neutral liquids.
First, heat the water until it boils. Boiling water will evaporate a large amount of water vapor.
Then the volume in the can. is limited and the water vapor evaporates. The original air is expelled and the volume is preserved. This is a knowledge point
Then it is poured into cold water when it is cold.This is another knowledge point<. /p>
Finally, after the water vapor is liquefied, the gas in the tank decreases and the pressure decreases, making the air pressure inside the tank much smaller than the pressure of external air, causing the tank to be flattened by external force until the tank is flattened. the internal air pressure and the external air pressure are not much different, and the force will cause the object to deform, this is a point of cKnowledge
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