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ammonia the gas with a strong smell that is formed by combining nitrogen and hydrogen. Ammonia is used to make refrigerators cold and in making fertilizers. [1/2 definitions]
carbohydrate a compound made of carbon, hydrogen, and oxygen. It is formed by plants, and it is used in the body to easily produce and store energy. Sugars and starches are carbohydrates.
fat a white or yellow oily substance found in some parts of animals or plants. Fat is made of carbon, hydrogen, and oxygen. [1/4 definitions]
H-bomb a very powerful bomb that releases energy by nuclear fusion. "H-bomb" is short for hydrogen bomb.
hydrogen a very light gas that burns easily and is one of the chemical elements. Hydrogen is the most abundant element in the universe. It combines with oxygen to make water, and it is found in all living things. Hydrogen combines with many substances and has many uses. (symbol: H)
hydrogen bomb a very powerful type of bomb. When its hydrogen atoms are forced together under great heat and pressure, they release energy in a huge explosion.
methane a gas made of carbon and hydrogen atoms that is stored in and collected from the earth. Methane is used for heating and cooking in the form of natural gas.
neutron a small particle present in the nucleus of all atoms except the hydrogen atom. Neutrons have no electrical charge. The mass of a neutron is about equal to the mass of a proton.
nuclear of or having atomic or hydrogen bombs. [1/3 definitions]
oxygen a gas with no color or smell that is one of the chemical elements. Oxygen combines with hydrogen to make water. It also makes up about twenty percent of the earth's atmosphere. Most living things need oxygen. (symbol: O)
protein a substance that is made up of nitrogen, carbon, oxygen, hydrogen, and possibly other elements. Proteins are found in all living things and are a necessary part of life processes.