Continues to publish our digests "Simple Science". By the way, today is the 36th edition of the three years.
In today's issue:
light in liquid nitrogen; chemical trick with a handkerchief; bending water; quantum levitation. ul >
Light bulb in liquid nitrogen h4>
CAUTION: breaking glass flask we bared contacts, which are connected to the current 220v. This voltage is dangerous to life!
In the experiment clearly shows how open spiral filament lamp burns rapidly in air and remains intact when immersed in liquid nitrogen. We can conclude that nitrogen is not an oxidizing agent and in liquid form does not conduct electric current.
During the production of incandescent light bulbs, the example that we have broken prior to the experience, they are filled with an inert gas. One such gas is argon, and sometimes nitrogen.
A chemical trick with a handkerchief h4>
Experience is based on the formation and destruction of crystalline compounds. Demonstrates the change in color of the compounds when adding or removing water. Initially cobalt chloride solution has a pink color. Upon heating the water evaporates from the surface of the handkerchief, and cobalt chloride precipitates as a pink crystalline. Further heating leads to the destruction of the aqua complex. Thus, at temperatures above 110 degrees Celsius compound is converted to anhydrous CoCl2 having a blue color. Once again we are adding water, the water is incorporated in the crystal lattice, the newly formed crystalline and shawl again acquires a pink color.
Curvature of water h4> < br />
In the video inaccuracy in Postproduction: bending jet can be seen directly on the camera, but this camera should have set the shutter speed (tents), which should be as low as possible and abyt experience or conduct on the street on a sunny day, or use additional lighting. But such a function has not all cameras, especially amateur camera. Our aim is to show how this can be done even at home. For example, there is the camera shoots at 240 frames / sec, and the iPhone 6 already has the capability of such a survey.
Quantum Levitation h4> < br />
Remind about our books those who have not yet had time to buy a gift to your child or nephew for the new year.
Source: habrahabr.ru/company/gtv/blog/241700/
