Surface tension, taking soapy water as an example.

Steam machine

When water is heated, intense vaporization occurs. The vapor pressure rises, eventually causing the cork to fly out.

When the volume level gets above 155-160 dB, the car starts shaking and almost bursting with vibration. At low frequencies, the windows burst.

The law of momentum conservation for rotational motion.

Besides liquid in the flask, there is also gas, which expands when warmed by the heat of the hand.

The temperature of the gas rises, so the pressure of the gas also grows. Increasing pressure of gas inside leads to the fact that the liquid begins to move upwards, against gravity, to the part of the flask where the pressure is less. When the gas in the lower part cools down, the liquid comes back down again.

A clear process on the fuel consumption in a rocket.

Levitating pots with houseplants

The levitation effect is realized with the help of magnets in the planter and the stand.

Rehbinder Effect visual demonstration

It represents an adsorption reduction of strength — a change in the mechanical properties of solids due to physical and chemical processes causing a decrease in the surface energy of the body.

In the case of a crystalline solid, what is also significant is that the crystal exhibits the defects in structure necessary for the nucleation of cracks, which then propagate under the influence of the medium.

In fact, it is an optical illusion.

In this video, the frame rate of the camera unit coincides with the rotation frequency of the helicopter blades. That is why it appears that the blades are not rotating.

If the Moon were a giant mirror.

The drops of water act as a collecting lens, the image for the observer is inverted.

A collecting lens is a lens which is thicker in the middle than at the edges.

If we place the lens on the window sill and get an image of distant objects outside the window on the screen, the distance between the lens and the screen will be equal to the focal length.

The way soap acts?

Liquid molecules experience mutual attraction forces, thus causing surface tension.

By getting into the surface layer of water, soap molecules noticeably weaken the surface tension forces.
Soap and laundry detergents reduce the surface tension of water, increasing its permeability. Therefore, soapy water soaks in and cleans fabrics and other materials, taking the dirt away with it.

AREOMETER

Concentration and density data are in constant demand. The strength of alcoholic beverages, the quality of acid in a battery, the condition of antifreeze, saline solutions, and the content of soluble substances in juice are just a few of the tasks where areometers are indispensable.

Demonstration of a mere application of physics.

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Van de Graaff generator in action.

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Visual illustration of the force of pressure ejection when a tire explodes.

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The vacuum was kept until the can was tilted.

The neck of the can is covered with a wire mesh. As it tilts it, the surface tension of the water prevents air from passing through the mesh until it flips over, increasing the pressure at the bottom and allowing air to displace the water at the top.

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Two-dimensional magnetic levitation.

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Ballistics

All shot at 100,000 frames per second.

Comparison of various pistol and rifle ammunition.

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Effect of temperature on the material

The vast majority of substances expand when heated.

This can easily be explained in terms of the mechanical theory of heat, since the molecules or atoms of a substance begin to move faster when heated.

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