Does iron float? Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Does iron float? Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

What a question? Throw a carnation, a screw, a ball from a bearing into the water - they will all immediately drown. A square cut out of tin from a tin can will also go to the bottom. It floats no better than an ax or an iron.

But try to bend the same square into a box. Look, it floats! Now you can put a carnation, a screw, and a ball in this box, it will only sink deeper, but it will not go to the bottom. And in a large iron box, an ax with an iron will be able to travel on water. Steel ships with steel guns, steel machines, steel anchors on heavy steel chains are sailing on the sea!

Does iron float?

Of course, you understand why this is so. Steel ships have air. It takes up a lot of space. Like a giant swim bladder! If you let water in instead of air, the ship will immediately sink. You can make a "shipwreck" with your tin box. Punch its bottom with a nail, and you will see how the ship that has received a hole sinks!

Author: Galpershtein L.Ya.

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Jaw movement generates electricity 18.09.2014

Canadian scientists have created a "smart" strap that can convert and store mechanical energy from jaw movements (for example, in the process of chewing gum). The accumulated energy in the future can be used to power electronic devices.

To generate electricity, the device uses a polymer material with piezoelectric properties. When stretched and compressed, a potential difference arises in the material, and an electric current appears in the circuit. The strap is attached to the lower jaw with headphones and special devices. When the jaw moves, the strap stretches and contracts, resulting in an electrical current.

According to scientists, only during meals, such a device can develop an average power of up to 7 mW. The researchers found this out during experiments in which they asked participants to chew gum. Experts concluded that the power developed by the strap is too small to power modern electrical appliances. But they are going to eliminate this drawback by increasing the number of layers of piezoelectric material in the strap.

In particular, according to scientists, 20 layers of piezoelectric material with a total thickness of 6 mm will be enough to obtain an output power of 200 microwatts, which is enough to power a hearing aid.

The piezoelectric material is the most expensive constructive part of the apparatus, the cost of which is about $20 per prototype. Scientists believe that the purchase of a "smart" strap will be more profitable than buying conventional disposable batteries: it will be able to justify the investment in about 3 years. In addition, the developers pay attention to the reduced negative impact on the environment in the case of using an unusual device compared to traditional batteries.

According to experts, a "smart" strap can be useful for providing electricity to various miniature devices, incl. implants and low-power gadgets. In the future, engineers plan to equip the strap with a special chip that will control the power circuits.

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