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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. The enormous number of molecules in even a small volume of a dilute gas produces not complication, as might be expected, but rather simplification. 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. Natural gas, colorless highly flammable gaseous hydrocarbon consisting primarily of methane and ethane It is a type of petroleum that commonly occurs in association with crude oil It is widely used as a fuel and is especially important in the generation of electricity. 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 Learn more about gas laws in this article. A substance (such as oxygen or hydrogen) that is like air and has no fixed shape A gas or mixture of gases that is burned as a fuel It may be somewhat surprising to learn that there is no fundamental distinction between a gas and a liquid It was noted above that a gas occupies a volume about 1,600 times greater than that of an equal weight of liquid. Diffusion in dilute gases is in some ways more complex, or at least more subtle, than either viscosity or thermal conductivity. The equation eventually fails as the density is increased, however, because other molecules exert forces and change the rate of collisions with the walls.