Physics

2022-10-28 21:00:01 Anodizing

It is a method of increasing the corrosion resistance of a metal product by forming an oxide layer on its surface. Открыть/Комментировать

2022-10-28 14:00:02 Laminar flow

This is a flow in which a fluid or gas moves in layers without stirring or pulsation (i.e. without random rapid changes in velocity and pressure).

Laminar flow is observed at low velocities of the fluid. The outer layer of liquid adjacent to the surface of the pipe in which it flows sticks to it due to the forces of molecular adhesion and remains immobile. Открыть/Комментировать

2022-10-27 21:00:02 Iron can burn

Under normal conditions, the oxidation rate of iron depends strongly on its form: a simple piece of metal does not burn, but thin fibers of iron or fine powder can easily be ignited.

It all depends on the contact surface of the iron with the air: it should be enough so that the oxidation reaction can sustain itself.

Iron wool consists of fairly thin fibers of iron. Oxidation on such a surface produces enough heat to keep the reaction going, and it runs "on its own”. Открыть/Комментировать

2022-10-27 14:00:01 Acoustic dispersion

When a sound wave passes through a solid medium (e.g. ice), high and low frequencies separate. Being faster, the high-frequency waves travel ahead of their low-frequency counterparts. As a result, you may hear a gap between the high notes and the low notes contained in the same sound. Открыть/Комментировать

2022-10-26 21:00:02 Testing the strength of a chicken egg Открыть/Комментировать

2022-10-26 14:00:01 Capillarity

The capillary effect is the rise or fall of a liquid in narrow channels or porous bodies. This is due to the fact that the liquid tends to wet the surface of the channel and rise up, despite the force of attraction. Открыть/Комментировать

2022-10-25 21:00:03 Experiment with the Jeep Wrangler

SUV behavior on the road with square, hexagonal, oval and triangular wheels. Открыть/Комментировать

2022-10-25 14:00:02 Infinity Mirror

The basic idea of the product is the combination of an ordinary mirror, partially transparent glass (mirror) in front of it and diode illumination.

Due to the fact that the point light sources are reflected in the outer and inner mirrors repeatedly, there is an effect of gradual "fading", a sense of depth. Открыть/Комментировать

2022-10-24 21:00:02 Start a fire with ice?

That's easy.

Just make a collecting lens out of a piece of ice in which the central part is thicker than the periphery.

Fire making with lenses is based on the fact that the sun's rays and the heat energy they carry are concentrated in one point due to the refraction of the light by the walls of the lens. If a flammable rubbish is placed at this point, it will quickly heat up and begin to smolder. Открыть/Комментировать

2022-10-24 14:00:02 How warm and cold water mix

Warm water is less dense than cold one. And anything that is less dense tends upwards, while anything that is more dense tends downwards. Открыть/Комментировать