ammonium nitrate Han Zecheng

Ammonium nitrate
Hydrogen, Nitrogen, and Oxygen
NH4NO3

Hydrogen
Hydrogen is the lightest element discovered. At room temperature, it is transparent, and flammable. Because of its light weight, most of the hydrogen in the earth's atmosphere have already left earth, although it can be created artificially. Due to its light weight, one of the key uses of hydrogen gas is in balloons. Meteorologists use it in meteorological balloons or weather balloons. These balloons carry instruments to measure atmospheric conditions.

Nitrogen
It makes up about 78% of the Earth's atmosphere. The element nitrogen is a colorless, tasteless, odorless and inert gas.Nitrogen can be used to make light bulbs, which are almost always filled with Nitrogen. A part of chlorophyll, amino acids, and nucleic acids, it is extremely important to the lives of both animals and plants.

Oxygen
An essential element needed for respiration (the production of energy from food), it is the most important factor for an animal or plant to survive. Oxygen is also what makes burning possible.  Combustion is used in many ways. For example, when oxygen is mixed with acetylene, it can create a very hot flame.


http://www.wisegeek.com/what-are-some-uses-of-hydrogen.htm
http://www.buzzle.com/articles/uses-of-hydrogen.html
http://library.thinkquest.org/J002959F/usesy.htm
http://www.buzzle.com/articles/uses-of-nitrogen.html
http://simple.wikipedia.org/wiki/Oxygen