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Gas holder
A gas holder, sometimes called a gasometer, is a large container in which natural gas or town gas is stored near atmospheric pressure at ambient temperatures. The volume of the container follows the quantity of stored gas, with pressure coming from the weight of a movable cap. Typical volumes for large gasholders are about 50,000 cubic metres, with 60 metre diameter structures.
Gasholders tend to be used nowadays for balancing purposes (making sure gas pipes can be operated within a safe range of pressures) rather than for actually storing gas for later use.
== Etymology ==
The term ''gasometer'' was originally coined by William Murdoch, the inventor of gas lighting, in the late 18th century.
Despite the objections of his associates that his so-called was not a meter but a container, the name was retained and came into general use. The word is also used to describe a gas meter (a meter for measuring the amount of gas flowing through a particular pipe). The term "gasometer" is discouraged for use in technical circles, where the term "gasholder" is preferred
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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