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Gas, one of the three fundamental states of matter, with distinctly different properties from the liquid and solid states. The remarkable feature of gases is that they appear to have no structure at all. They have neither a definite size nor shape, whereas ordinary solids have both a definite size
Greenhouse effect, a warming of Earth’s surface and troposphere (the lowest layer of the atmosphere) caused by the presence of water vapor, carbon dioxide, methane, and certain other gases in the air. Of those gases, known as greenhouse gases, water vapor has the largest effect.
Greenhouse gas, any gas capable of absorbing infrared radiation (net heat energy) emitted from Earth’s surface and reradiating it back to Earth’s surface, thus contributing to the phenomenon known as the greenhouse effect. Carbon dioxide, methane, and water vapor are the most important greenhouse gases.
Gas - Behaviour, Properties, Physics: The enormous number of molecules in even a small volume of a dilute gas produces not complication, as might be expected, but rather simplification. The reason is that ordinarily only statistical averages are observed in the study of the behaviour and properties of gases, and statistical methods are quite ...
Gas is one of the three principle states of matter. The properties of gases are distinctly different from those of liquids and solids—the other principle states. Gases have neither a definite volume nor a definite shape. In contrast, both solids and liquids have a definite volume, and solids have a fixed shape.
Kinetic theory of gases, a theory based on a simplified molecular or particle description of a gas, from which many gross properties of the gas can be derived. Such a model describes a perfect gas and its properties and is a reasonable approximation to a real gas.
Gas laws, laws that relate the pressure, volume, and temperature of a gas. Boyle’s law and Charles’s law can be combined to form the ideal gas law, a single generalization of the behavior of gases known as an equation of state.
Ideal gas, a gas that conforms, in physical behavior, to a particular idealized relation between pressure, volume, and temperature called the ideal gas law, which states that the product of the volume and pressure is proportional to the absolute temperature.
Solid, one of the three basic states of matter, the others being liquid and gas. A solid forms from liquid or gas because the energy of atoms decreases when the atoms take up a relatively ordered, three-dimensional structure.
Air, mixture of gases comprising the Earth’s atmosphere. The mixture contains a group of gases of nearly constant concentrations and a group with concentrations that are variable in both space and time.