Walking Water is a fun science experiments for kids to do at home which works on air pressure and gravity. We experience both air pressure and gravity in our life and we’ll use these concepts to make this experiment work! In this experiment, you will see how water can walk uphill against gravity from one glass to the other. Is this possible? Let’s find out!
Safety First! Adult Supervision Required. Don’t Eat/Drink your Experiments, Wear safety goggles where ever required
Materials and tools required.
In the box
- Glucose Pipe
- Transparent Glass
- Transparent Bowls
- Red Cabbage Flakes
- Food Color
- Baking Powder
Video on Youtube for the Experiment
What to Do! – Instructions
- Pour 100ml water in two transparent bowls each.
- Add food colours in each bowl. Pour the water in two glasses.
- Take a glucose pipe and place each end in each glass.
- Insert a pipette in the glucose pipe and pump to get the water to flow to the other end.
- The water inside the pipe rises but flows back again in the glass
- Now, place the glasses at different levels and connect it with glucose pipes.
- Insert a pipette in the glucose pipe and pump to get the water to flow to the other end again. When you are pumping it make sure the pipe is kept lower than the level of water in the upper glass.
- You will see the water rise against gravity and flow to the lower glass.
- When you lift one end of the pipe from the lower glass, watch the water flow.
- Once both the ends of the pipe are at the same level, the liquid will stop flowing and run back.
- Repeat the experiment with more glasses.
- You can innovate the experiment with red cabbage juice also!Fill red cabbage, bleach, vinegar, water and baking powder in five separate bowls.
- Keep the red cabbage on a higher level than the other four
- Place the pipe in each bowl.
- Now, observe the color change in each bowl once red cabbage flows into them.
Images for Instructions
Working Principle of Walking Water :
In this experiment, you can see how water travels against gravity from one glass and flows to another glass using an inverted ‘U’ shaped tube. This is also known as a siphon. I’m sure, you’ve also heard – ‘’a piece of tubing was used to siphon petrol’’!
Initially, when we keep the two glasses on the same level there is no exchange of liquid. Once the glasses are kept at different levels, the water flows from one container to the other. This tells us that there is a particular reason why the water flows. It is atmospheric pressure and gravity!
When we pump the tube with the pipette, we draw out the air which creates a vacuum. The external air pressure then forces the liquid from the upper glass to flow into the tube. The tube is then dropped into the lower glass and the water from the upper glass flows into the lower glass because of gravity. This happens as long as an equilibrium is reached. The equilibrium is reached when both the ends of the pipe are at the same level because then the external air pressure is same on both the ends. This method is also used to irrigate fields and evacuate water from buildings after floods.
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