## The water

Published June 29, 2016

Two-thirds of the Earth's surface is the water, whose mass is 1,5*1021 kg. The water makes the cycle in nature. On the surface of oceans and seas the water evaporates rapidly, forming clouds. From the clouds, it is poured over the Earth, it seeps through the soil, forming a considerable size of the underground reservoirs of fresh water. And of them originate the river...

## The diamond

Published August 13, 2016

The diamond is a crystalline substance with interesting optical properties. The diamond is extremely hard and is used for final polishing of most materials. The refractive index is very high – 2,4. The reflectivity of any transparent body is associated with the refractive index. The reflectivity of the glass, for example, is 4%. Diamond has a very high reflectivity – 18%...

## The poles of the magnet

Published August 30, 2016

How to determine the poles of the magnet? This question is not as simple as it seems at first glance. After all, we have no confidence that the magnet poles are not painted in different colors just to distinguish them. In addition, the magnet can not be labeled at all...

## The color

Published September 24, 2016

Turn on a table lamp in the room, illuminated with white light. Pre-screw in it a red lamp. Put on the table a sheet of white paper. Place the lamp between him and any small object such as a pencil. On a sheet of paper will be his shadow. But its color is completely unexpected. It is not black, not gray but green...

## The atmospheric pressure

Published September 24, 2016

The atmospheric pressure can be estimated if a glass bottle filled with water. Pinch the hole with your fingers and dip the neck of the bottle into the water. Then open the neck of the bottle by taking away his fingers. The atmospheric pressure will support a column of water in the bottle. It drives the water in a bottle...

## The density of the water

Published September 24, 2016

The density of the water varies depending on the temperature change. Do a simple experiment to prove it. Take the empty eggshells from which very carefully through a small hole produced all the contents. Close up the hole with a wax. Attach to the wax on the wire or thread a small sinker...

Page ‹‹ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 ››