PETROLEUM (पेट्रोलियम) Petrol At some places in nature, a thick, viscous and dark colored liquid is found under the rock, which mainly contains aliphatic hydrocarbons up to C 1 to C 40 , this fluid is called refined oil or petroleum. The word petroleum is derived from the Latin words petra and olium which is found under rocks within the earth, hence it is also called mineral oil. Within the earth, this fluid floats above the salt solution. A gas atmosphere exists along with the floating petroleum inside the Earth, which is called natural gas. Petroleum is also called liquid gold. In the present era, this fluid is more valuable than gold for any nation. The progress of any nation depends to a large extent on how much petroleum it has. Its use is very important in various tasks like agricultural industry, traffic communication etc. This oil is found in the highest amount in the United States. Russia Venezuela is also found in greater quantities in Mexico, Burma etc. ...
Magnet Magnet Magnet is a substance or object that generates magnetic fields. The magnetic field is invisible and the main properties of the magnet - this is due to the attractiveness of drawing magnetic substances nearby and attracting or replacing other magnets. Types of magnet Some magnets are also found naturally but most magnetism are produced. The magnet produced can be of two types: Permanent magnet The magnetic field generated by them is obtained without any external electrical current. And under normal circumstances there remains no shortage. (They have to make special arrangements to dabotagite (D-magnetize). These are made from so-called hard (hard) magnetic materials. There are also several types of these: Metallic element magnet (eg some iron ore, cobalt, nickel etc.) Mixed or composite (ferrite magnet, alnico magnet) Sparse Soil Soil (Samaria-Cobalt Magnets, Neodymium-Iron-Boron Magnets) Single-molecule magnet and single-chain magnets Nan...