floating blade. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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floating blade. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

The blade of a safety razor, despite being steel, can float on the surface of the water. You just need to take care that it is not wetted with water. And for this it needs to be lightly greased. Place the blade carefully on the surface of the water.

Place a needle across the blade, and one button at the end of the blade. The load will turn out to be quite solid, and you can even see how the razor is pressed into the water. It seems as if there is an elastic film on the surface of the water, which holds such a load on itself.

floating blade

You can also make the needle float by first lubricating it with a thin layer of fat. It must be placed on the water very carefully so as not to pierce the surface layer of water. This is best done with a piece of dry paper, forcing the needle to roll off it, from a very small height, into the water. The needle should lie flat on the water without breaking through its surface. You may not succeed right away, it will take some patience and practice.

Pay attention to how the needle is located on the water. If the needle is magnetized, then it is a floating compass! And if you take even a small magnet, you can make the needle travel through the water.

Author: Rabiza F.V.

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Avoid emulsifiers 22.07.2013

Scientists from the Norwegian University of Science and Technology have found a new way to control the behavior of oily substances using an electric field. Despite the seeming insignificance of this discovery, it can radically change many production processes that are used very widely: from the food industry to the oil industry.

Each of us uses certain products containing oils and fats: from sunflower oil for frying, to shampoos and car fuel. Many food products are made on the basis of an emulsion, that is, a mixture of water and oil. It is very difficult to maintain this mixture in a pleasant-looking and tasting state, the most careful selection of emulsifiers is responsible for this. Note that it is very difficult to choose the right emulsifier and its concentration (corresponding products are tested even in space!), but even after a long and expensive development, an unattractive product is often obtained, moreover, with an emulsifier substance that is not the most beneficial for health. Similar difficulties are experienced by the oil industry: when separating a mixture of oil, water and gas.

But it seems that Norwegian researchers have found a way to solve this problem: they have developed a technology for controlling oil droplets using an electric field. Scientists conducted a very simple experiment: they placed clay microparticles in liquid silicone. Of course, as expected, the microparticles immediately stuck around the oil drops, simulating the age-old problem of separating and mixing emulsions. However, when an electric field of a certain strength was created, clay microparticles quickly lined up in a ring around oil drops, and by controlling the electric voltage, it is possible to control the process of growth of rings from microparticles.

Thus, there was a way to control the properties of the emulsion without the need for any chemicals. Perhaps the new technology will be useful in the production of foodstuffs, household products and cosmetics, in the creation of new drug delivery vehicles in the human body, as well as in increasing the recovery of oil-bearing formations.

Currently, scientists are engaged in a new series of experiments with various types of emulsions and hope that their development will find the widest possible application.

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