Technology

Jet propulsion Introduction Jet propulsion is said to be the process at which thrust produced by passing a jet of matter in the opposite direction to the direction of motion. In this Newton's third law applied, the moving body is propelled in the opposite direction to the jet. Now a days it is commonly use for the spacecraft propulsion. Jet propulsion revolutionized the science of flight by dramatically increasing possible speeds and altitudes, hence enabling space exploration. The term jet propulsion refers to the action produced by a reactor to the ejection of matter. Principle jet propulsion. There are many everyday examples of jet propulsion. A blown-up toy balloon with its neck closed shows no tendency to move because the air inside is pressing equally in all directions. If the neck is opened suddenly, the balloon shoots away. The escaping air relieves pressure at the neck, and there is a reaction from the air opposite the neck. It is not the air rushing out of

Environmental pollution Environment. Environment can be defined as it is the area in which something exists or lives. Environment is everything that is around us. It can be living or nonliving things. It includes physical, chemical and other natural forces. Pollution. Pollution is defined as Undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities Environmental pollution. Environmental pollution mean that the surrounding area in which we live is being pollute intentionally or unintentionally by different type of means of land, water, air and effecting all living things life and the nature. OR Environmental pollution can be defined as any undesirable change in Physical, Chemical or biological characteristics of any component of the environment (water, air, soil) which can cause harmful effects on various forms of life or property.   Types of Environmental pollution. There are different type