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helium
Science; General science
A gaseous chemical element, He, atomic number 2 and atomic weight 4.0026. Helium is one of the noble gases in group 18 of the periodic table. It is the second lightest element. ...
krypton
Science; General science
A gaseous chemical element, Kr, atomic number 36, and atomic weight 83.80. Krypton is one of the noble gases in group 18 of the periodic table. Krypton is a colorless, odorless, ...
neon
Science; General science
A gaseous chemical element, Ne, with atomic number 10 and atomic weight 20.183. Neon is a member of the family of noble gases. The only commercial source of neon is the Earth's ...
oxygen
Science; General science
A gaseous chemical element, O, atomic number 8, and atomic weight 15.9994. Oxygen is of great interest because it is the essential element both in the respiration process in most ...
atmosphere
Science; General science
A gaseous layer that envelops the Earth and most other planets in the solar system. Earth, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Titan (Saturn's largest satellite) ...
synthetic fuel
Science; General science
A gaseous, liquid, or solid fuel, also known as synfuel, that does not occur naturally. Synthetic fuel can be made from tar sand, coal, or oil shale. Included in the category are ...
swim bladder
Science; General science
A gas-filled sac found in the body cavities of most bony fishes (Osteichthyes). The swim bladder has various functions in different fishes, acting as a float which gives the fish ...
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