What Do You Know About Formation Of Soil? In the absence of a cover over the earth the existence of man would have not been possible. Plants could have not grown. Food for human beings and animals would have not been...
What Is Water Composed Of? Scientists wonder whether life is there on other planets. The existence of life is possible only if there is water. It is an odourless, tasteless, colourless compound and is in major proportion in all living things....
What Is Called “Oxygen”? Often we read about something that man “could not live without”. One thing that is absolutely essential to life is oxygen. A human being can not live without oxygen, beyond a few minutes. Oxygen is the most...
What Is Fire? ‘Combustion’ is the scientific name given to burning. These are of different types. Oxygen from the air combines with another material that can burn. This reaction produces heat. In case the process is rapid, we see flames or...
What Is The Barrier Of Sound? The name “sound barrier” is actually a wrong way to describe a condition that exists when planes travel at a particular speed. When the speed of sound is attained, a kind of barrier is expected,...
What Is The Speed Of Sound? We make a sound every day, and with every sound, there is something that vibrated somewhere. Something moves back and forth rapidly. The sound starts with the vibration of an object. Sound has to travel...
How is a Mirage Caused? Assume a man moving about in the desert and feeling thirsty. He looks off at a distance and sees a lake of clear water, surrounded by trees. He moves on and stumbles to find only hot...
What Are X-Rays? Wilhelm Roentgen, a German scientist discovered in the year 1875, X-rays. These rays are also called Roentgen rays. Similar to light rays these are penetrating rays. They differ from light rays in the length of their waves and...
What Is Meant By Radioactivity? In the present time, everybody in the world has heard about radio-activity. There may hardly be an exception. The testing of atom bombs creates radioactivity. This is one of the great problems faced by mankind now....
What Radium Is? Radium is a radioactive element. The elements are made up of atoms. In general, atoms are stable, meaning that they do not change from year to year. A few heaviest atoms break down and change into other kinds....