Nitrogen is the seventh most abundant element in the universe. Life on Earth depends on nitrogen, with approximately 2.5 percent of the weight of living creatures coming from nitrogen contained in organic molecules. The abundance of nitrogen in the universe causes many scientists and researchers to conclude that life exists elsewhere beyond the confines of Earth.
Liquid nitrogen is used as a refrigerant. If liquid nitrogen comes into contact with a person's skin, it immediately causes severe frostbite.Learn more about Chemistry