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My experiment: paper on cup, sealed
Materials: cup, water, any type of paper

observation: the water in the glass pushes air out of the cup, resulting in no air pressure inside the cup. Since air particles move freely, the atmospheric pressure around the cup pushes onto the paper, keeping it in its place.

I really enjoyed it, and it took me a couple tries to get it since i had to try various kinds of cups, so i advice anyone who wants to try this, to use cups with straight brims.

Extra tip: be careful while doing this, because if u shake it to much or keep it for a really long time, the paper will eventually weaken and the water will break out. so don't do that in the presence of ur mother, or in any area that she holds close to her heart, like the kitchen. you might end up with a mess to clean up.

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In my glass all the air gets sucked in my mouth. When my mouth gets closed the glass will be empty. My mouth is acting like a vacuum.

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Aim:
To find the effect of atmospheric pressure on an object

Requirements:
A suction cup

Method:
Stick the suction cup on a wall.

Observation:
The suction cup stayed on the wall for 3-4 seconds, but after that, it fell out.

Conclusion:
Atmospheric pressure acts on objects. This creates many important phenomena such as suction.
Here, the cup stayed for a few seconds before falling out. The atmospheric pressure prevented it from falling out, but after a while, due to wearing out, the air was able to escape thru some holes. This made the cup fall out.

Safety Steps:
Nothing at the moment

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Upside down glass of water experiment :

Requirements -

One glass of water and paper.

How it works -

When you fill a glass with water till the brim and put a piece of paper on it, and turn the glass upside down, there is water/gravity pushing the water in the glass downwards while the atmospheric pressure is pushing the paper upwards and as the atmospheric pressure that is pushing upwards is more, the water does not spill out of the glass.

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Aim:

To find out the effect of atmospheric pressure on an object

Requirements:

-           A glass of water

-          A straw (preferably made out of plastic)

Method:

Take a glass and fill it with water. Next put a straw inside the glass. Wait for some water to fill up the straw. After doing this, take the straw out.

This time, cover the top end of the straw with your finger and then put it inside the glass.

Observation:

First try – The water did not stay inside the straw.

Second try – The water stayed inside the straw this time.

Conclusion:

While taking the straw out of the glass, air kept entering the inside of it and pushed the water out. Also, gravity pulled the water down.

Since the top end of the straw was covered with my finger, there was not much air to push the water out. The atmospheric pressure acting on the bottom end of the straw was more than the pressure of air inside the straw and gravity trying to pull the water down.

Hence, nothing can push the water out this time.

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My Experiment: Gas pump for bicycle-
(The radius of the cylinder is 0.75 inches)
When I pull the piston up, I take in all the atmospheric air. When I push the piston down, the force applied is 50N, and the area of the cylinder is 5.452225cm2, resulting the pressure to be 9.17 N/cm2.
Such pressure causes the valve of the tire to open, and lets the air go to fill the tube.
This is how you can fill a bicycle tire with atmospheric pressure and an air pump

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All the air which is inside my glass will be sucked by my mouth and the cup will be empty after that. Its like a vacuum. It keeps the glass attached to my mouth

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MATERIALS NEEDED :

Glass cup, water, index card

EXPERIMENT:

In this experiment you fill up 1/3rd of the glass with water and the rest (2/3rd) will be filled with air

Then you cover the mouth with a tissue paper and turn it upside down over a sink

OBSERVATION :

The water in the cup is pushing downwards whereas the atmospheric pressure outside is pushing upward, as the water is lighter than the air, the water stays in the glass

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Steps:

Step 1: take a bowl with a candle in the middle.
Step 2: pour water inside the bowl (remember to make sure the water doesn't reach the top of the candle)
Step 3: light the candle.
Step 4:take a glass and cover the candle with it.

Observation:
I saw that the candle’s fire goes out after a few seconds. This happens because the burning candle heats the air above it and it uses up all the oxygen trapped inside the glass. When the candle goes out, the air in the glass cools and becomes vapour. The pressure inside the glass goes below the atmospheric pressure because there is no air left inside the glass (a vacuum is created). Water is drawn into the glass until the pressure is equalized.

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Straw and water experiment. (Explained in the video)

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Vanya Nath-Creating Vacuum with a candle

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Vanya Nath-Creating Vacuum with a candle

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My journey and observations are collaborated in the video above.

Hypothesis-I knew that the fire in the glass would create a higher pressure than on the outside. This may have caused a suction effect on the brim of the glass.

How it works-The setup I gathered for this experiment is a candle, matchbox, glass, steel plate, and coloured water. I put the candle or diya on the plate, and lit it. then i filled the plate with my blue colored water till right before the edge of the candle.
Then I put a glass, making the candle inside diffuse, and water from outside to travel in.

Observation-I observed that within 5 seconds of putting the glass over the candle, it lit off, and floated on the water travelling from outside the glass to in the glass. When I tried to lift off the glass, it stayed stuck to the plate, until I applied a harder pull.

Conclusion- After the experiment, we can conclude that vacuum was made in the glass-hence it was not lifting up. The way this happened was because the flame on the inside created a higher air pressure, than the air outside the glass. Hot air in the glass has a higher energy and therefore exerts more air pressure. The higher pressure pushed the water down and out of the glass. The result of this, as you could see in the video I made of my observations. was the bubbling outside the brim of the glass, due to air forcing the water out. Fire needs oxygen in order to continue the exothermic process in the glass, but because I trapped air in the glass there is only a small amount.  When the flame uses up all of the oxygen it goes out, which allows the air to cool down.  Cold air doesn’t have as much pressure as hot air and has less pressure than the air outside of the glass.  Therefore the air on the outside of the glass pushes with greater force on the water than the air on the inside so the water is able to get sucked back up into the glass. When the water level evens out that is  when we have reached an equilibrium of air pressures once again-and that is why the vacuum did not stay for long, and harder pull could lift the glass.

Safety steps-Since I was working with flame, I didn't sit near wood or paper, and was under my mother's supervision.

All in all I really enjoyed this experiment, and it was fascinating to see such a quick reaction happen before my eyes, but such a lengthy meaning behind it. I hope you enjoyed seeing my observations too.

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Creating Vacuum with a candle-Vanya Nath - Made with Clipchamp_1631942157732

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Experiment: Candle Extinguishing Experiment

Process: Put water on a plate, and light a candle on top of that. Take a glass and cover the candle. The candle will get extinguished because there is not enough oxygen needed by the candle to stay lit.

Materials Needed: Candle, Lighter, Glass, Plate, Water

Observations: I saw the water rise in the glass while the fire was getting extinguished because there was more space being created because of the oxygen being consumed

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The experiment I chose- Water pressure experiment.

Things you need

1. cardstock
2.cup of water

How it works-

You have to take card stock or any thick paper cut it in half .Then take a cup and fill it with water ¾ of the cup ,then place the cardstock on the brim of the glass of water. Then gently tip over the glass. And boom! You’ll see water pressure in act.(Remember to do this in front of a sink!)

How it turned out-

It was a fun experiment, and it showed me how water pressure actually works, This was a fun experiment and when I was younger I thought this was magic ,but thanks to Ekta ma’am I know it’s not magic it’s just physics.

Bonus-

I did also try this experiment with tissue paper. The experiment was was done as above except I changed one factor, the cardstock .It didn’t work and all the water leaked. I  also used coaster, this experiment worked well with that

(sadly I couldn't get a video but here is photo that looks really similar to what I did.)

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The air inside the glass is sucked into my mouth. I close my mouth meaning there is almost nothing in the cup so, there is vacuum (but not total vacuum). The vacuum keeps the glass stuck to my mouth.

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My video-

How this works

This works as when there is air in the tetra pak, the air inside the tetra pak balances it and the atmospheric pressure so the tetra pak can retain shape. But when I suck out the air, the force becomes imbalanced as the atmospheric pressure becomes greater and crushes the tetra pak.

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Physics atmospheric pressure experiment with tetra pak Aditya Bhat 7B