Simple Science - digest of updated experiments # 27

A year and a half has passed since the beginning of the work of the channel SIMPLE SCIENCE . Behind the back of more than 200 experiments. We decided to celebrate this event by releasing a short video:

Now we present our experiences in an updated form. We tried to make them even more spectacular and informative. And not without pride we present four videos of a new format to the audience:
  • useful experience;
  • beautiful experience;
  • useless experience;
  • an experience that should not be repeated.

Battery and gum fire

The foil consists mainly of aluminum, steel and tin. And therefore, it is an excellent conductor of electric current. Closing a piece of foil to the battery terminals, we get a simple electrical circuit, which, thanks to our scissors, consists of three parts connected in series.

Current flows through the foil and heats it like a spiral in an electric stove or light bulb, but unevenly, because the thinner the conductor, the more resistance it has, the more energy is released. A thin (about 2 mm) piece of foil on the jumper heats up more strongly than the rest and is heated. The paper glued to the foil ignites due to high temperature, and from it - a piece of cotton wool, which, in turn, ignites a candle. Everything is simple.

For experience, you will need: a new AA battery or similar, packing of chewing gum records, cotton wool, a candle.

Ocean in a bottle

Vegetable oil does not mix with water and is placed on top of water. You can experimentally select a solid (for example, a float) so that it will be on the border of these liquids.

If the bottle is half filled with tinted water and the rest is filled to capacity with oil, there will be no air left in the bottle. The viewer will have the impression that the bottle has a blue ocean. And if you shake the bottle, you get a real storm.

For experience you will need: a plastic bottle, water, paint or food coloring, vegetable oil, a float.

We knock out the bottom of the bottle

Cavitation from Latin translates as "emptiness." Cavitation occurs as a result of a local decrease in pressure in a liquid, for example, with an increase in its velocity. At this point, cavities are formed in the fluid, which are called cavitation bubbles.

At the moment of impact, the pressure drops sharply at the bottom of the bottle. Moving with the flow to a region with a higher pressure, cavitation bubbles collapse, emitting a shock wave. The resulting shock wave causes the destruction of the glass.

For experience you will need: a glass bottle, water, a basin.

Fire balls

Gasoline burning is a complex physicochemical process. However, in our experience everything is really simple! It is gasoline vapors that burn (gasoline has a low boiling point of 33 ° C to 205 ° C). Heated pairs tend upward (remember how steam escapes from the spout of a teapot) and burn there. It turns out that combustion occurs only at the top of the ball (whatever one may say, the fumes will fly upward, flowing around the ball and burning). Until most of the gas burns out, keeping the balls below is pretty easy and almost safe.

Important note : the fabric must be used necessarily from 100% cotton.

For experience you will need: 100% cotton fabric, threads, gasoline, matches or a lighter.

And in conclusion, I want to once again tell you about our project with a children's book on a boom starter

August 8, Boomstarter launched a fundraiser for the publication of a book for children SIMPLE SCIENCE. To print 5,000 copies of the book, 380,000 rubles was required. And all this money was collected within 10 days. Largely - thanks to the habraeffect, which worked after our first publication about the book.

Since we were already working on the second book, we were offered to continue the project on a boom starter. To date, 625 people have already supported us (many thanks to you guys!) And 576.375p has been collected. Learn more about the book here . A pre-order for the book is also open there.

If you have not yet supported our project and are ready to do it right now - you can transfer money on the project page . There are described in detail all the rewards that sponsors receive. Any amount will be useful for business: from 50 rubles. to ... (no upper limit;)