## The dry, incomprehensible concepts and physical phenomena will become easier and more interesting with these wonderful experiments.

The dry, incomprehensible concepts and physical phenomena will become easier and more interesting with these wonderful experiments.

Physics in particular and science in general are relatively dry, difficult and often unattractive.

But that is only when you do not directly do scientific experiments. If you don't believe it, the following cool experiments will prove to show you how interesting physics science is. And know what, these experiments you can absolutely do at home.

## 1. Understand the concept of temperature - pressure by experimenting with eggs . squeezing into a bottle

Put an egg - whether boiled or not boiled - on the mouth of the bottle, do you think it can get in? The answer is here.

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Simple experiment with eggs and glass jars.

However, just drop a piece of paper that is being lit by a head through the bottle and then put the boiled egg, the result is different.

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Put a piece of fireproof paper in the glass jar.

The reason is that when a heat source is placed inside the bottle mouth, air molecules move chaotic and tend to separate. Moreover, the increased heat source will push the pressure in the bottle up high, and the air flow will move out.

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Then, place the egg on the vial and wait for an interesting phenomenon to occur.

However, when placing the egg in the mouth of the bottle, the atmosphere will be blocked. The oxygen in the bottle is limited, so the fire will turn off. The fire extinguished will drag the temperature down, the pressure drops , and eventually the egg is sucked in . This phenomenon is the same as when you are feeling a little.

Not only eggs, we can suck anything in, as long as it has enough elasticity to withstand deformation.

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After the fire goes out, the temperature drops, the pressure in the flask decreases so the egg is sucked into the jar.

## 2. Understand the compression pressure at a point by experimenting "watermelon burst"

Prepare a big watermelon and . several thousand strands to make this experiment. Note: done in a dry place to . clean for easy.

First, insert each string into the center of the watermelon as shown below.

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Attach each piece of string to the watermelon.

And this is what happens when enough rubber bands are tied.

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The watermelon is squeezed at the end of the rubber band and then exploded.

The cause of this comes from a fairly basic concept in physics: pressure. A string tied around the watermelon body has a small impact. However, when many strands combine around a narrow area in the middle of the melon, it creates a great pressure , and this force is enough to force the melon body to break apart.

Inside the watermelon there is a lot of water, so when the crust is torn, the pressure from the outside is released very quickly, causing the melon to burst.

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When many rubber bands combine around a narrow area in the middle of the melon, it will create a great pressure, squeezing the fruit body like the image above.

## 3. Understand the freezing of water by experiment "pouring water into ice"

Normally when water falls below 0 ° C (or 32 ° F), water will freeze.

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Water freezes even though it does not reach a temperature below 0 o C.

But if you use pure water, the water will create a different state called " supercooled water " - supercooled water. The water may reach below 0 ° C and still not freeze.

Why? That's because the water that wants solidification needs strange crystals - Nucleation - inside, such as dust, and pure water, there is no such thing. However, just a small impact like tapping the bottle or pouring water, the water bubbles (strange objects) will appear and water will immediately freeze .

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Gently squeeze the bottle of pure water to produce nucleation crystals, causing water to freeze immediately.

Once there are cold water bottles below 0 ° C, just pour on another surface, or simply touch your finger with water, the water in the bottle will immediately petrify.

## 4. Understand magnet magnetic field by "hovering" experiment

First, prepare 2 large magnets (these magnets you can take in old enclosures), 3 pieces of clay, 3 plastic bottles and a glass plate, and follow the picture below.

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Funny experiment on magnet magnetic field.

Next is to create the gyroscope. Use a wooden stick with 3 small magnets with holes in the middle, then attach them together. Please adjust the size of the winding wire yourself so that the spin can rotate in a balanced way.

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Put magnets together.

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The gyroscope is hovering in the air.

The principle of this phenomenon is actually very simple, that is the magnetic force of the magnet. Before you shoot, you need to place such a large magnet and a spinning top of the rotating pole, as shown in the figure, which is the North Pole.

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The large magnet and the turning top of the rotating rod are very positive.

Logically, the repulsive force between magnets will cause the gyroscope to hover at the equilibrium point with the rotation of the spin. However, the question is why do you come back . turning?

In fact, when the force of rotation slows down due to friction with the air, the spin will fall as shown below.

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The reason is that the magnetic force of the magnet, the polarity is pushed, the polar opposite is attracted.

## 5. Understand the effect of texture in construction materials with magic paper

With a proper structure, the pieces of paper can also carry tens of kilograms of bricks without changing.

First, prepare 6 small pieces of paper, roll them up as shown below.

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Prepare 6 small pieces of paper and curl up.

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Prepare to see the incredible power of the pieces of paper.

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Strong sheets of paper can withstand weight up to 27kg.

These tiles weigh up to 27kg.

You see, fragile sheets of paper can withstand very heavy weight. And the cause comes from the shape of the paper - cylinder (cylinder).

This is one of the basic knowledge in the construction industry. Specifically, the circular cylinder structure is the strongest, most robust structure, as it helps spread the compressive force onto the entire surface of the material and has no weaknesses .

## 6. Understand about magnetic field lines with magic tricks to "pan the pan" with magnets

This experiment alone cannot be done, but requires magnets in the Magination game set by Linkjendal in Norway.

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Magic tricks use tiny magnets in Magination toys.

Magnets have two poles - South and North - and the magnetic field around the magnet will have a magnetic field with a direction from the North to the South. That is also the reason that two magnets can only attract each other if left extreme, and push each other when extreme.

The key to this " magic " lies in the outer ring. In essence, it is also a magnet ring. Inside the magnet ring, magnetic field lines will take place as follows.

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Magnetic field lines of magnet circles.

It can be seen inside the magnet ring, the magnetic force will be directed upwards. But besides, the magnets placed in the wire loop will be affected by downward gravitational gravity.

Therefore, if the magnets are placed in a certain position, the magnetic field of the magnet and the gravity of the Earth will cancel each other out, creating an equilibrium state.

However, just a small effect is that the equilibrium will be broken: the magnetic field in the ring will cause some of the magnets to bounce up and suck in tightly.