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Many gases can be put into a liquid state at normal atmospheric pressure by simple cooling; a few, such as carbon dioxide, require pressurization as well. Liquefaction is used for analyzing the fundamental properties of gas molecules (intermolecular forces), or for the storage of gases, for example: LPG, and in refrigeration and air conditioning.
A gas cylinder is a pressure vessel for storage and containment of gases at above atmospheric pressure. Gas storage cylinders may also be called bottles . Inside the cylinder the stored contents may be in a state of compressed gas, vapor over liquid, supercritical fluid , or dissolved in a substrate material, depending on the physical ...
This rule is intended to stimulate the development of new gas storage facility in the ultimate goal of reducing natural gas price volatility. Commission Chairman Joseph T. Kelliher observed: "Since 1988, natural gas demand in the United States has risen 24 percent. Over the same period, gas storage capacity has increased only 1.4 percent.
Because of large volumes it is not practical to store natural gas, as a gas, near atmospheric pressure. However, when liquefied, it can be stored in a volume 1/600th as large. This is a practical way to store it but the gas must be kept at −260 °F (−162 °C). There are two processes for liquefying natural gas in large quantities.
Storage temperatures of 90 °C (194 °F) are sufficient to supply both domestic hot water and space heating. The first such house was MIT Solar House #1, in 1939. An eight-unit apartment building in Oberburg , Switzerland was built in 1989, with three tanks storing a total of 118 m 3 (4,167 cubic feet) that store more heat than the building ...
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The gas is compressed adiabatically with little temperature change (approaching a reversible isothermal system) and heat loss (approaching an isentropic system). This advantage is in addition to the low cost of constructing the gas storage system, using the underground walls to assist in containing the pressure.
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