| Dictionary: bot·tled gas |
| 5min Related Video: bottled gas |
| Chemistry Dictionary: bottled gas |
Gas supplied under pressure in metal cylinders. The term includes pressurized gas (e.g. oxygen and nitrogen cylinders) and gases liquefied under pressure (e.g. liquid butane for use as a fuel). Colour conventions are used to identify the type of gas or, in some cases, the specific gas. The colour indicating the contents is that of the shoulder of the cylinder at the top. The convention is not international, and practice differs in different countries. In the UK, the convention is:
Yellow for toxic or corrosive gases
Red for flammable gases
Light blue for oxidizing gases
Maroon for acetylene
Dark green for argon
Grey for carbon dioxide
Brown for helium
Blue for nitrous oxide
Black for nitrogen
White for oxygen
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| WordNet: bottled gas |
The noun has one meaning:
Meaning #1:
hydrocarbon gases, usually propane or butane, kept under pressure
Synonym: liquefied petroleum gas
| Wikipedia: Bottled gas |
Bottled gas is a term used for substances which are gaseous at Standard temperature and pressure (STP) and have been compressed and stored in carbon steel, stainless steel, aluminum or composite bottles known as gas cylinders.
Contents |
There are four cases: either the substance remains a gas at standard temperature but increased pressure, the substance liquefies at standard temperature but increased pressure, the substance is dissolved in a solvent, or the substance is liquefied at reduced temperature and increased pressure. In the last case the bottle is constructed with an inner and outer shell separated by a vacuum (dewar flask) so that the low temperature can be maintained by evaporative cooling.
The substance remains a gas at standard temperature and increased pressure, its critical temperature being below standard temperature. Examples include:
The substance liquifies at standard temperature but increased pressure. Examples include:
The substance is dissolved at standard temperature in a solvent. Examples include:
The substance is liquified at reduced temperature and increased pressure. These are also referred to as cryogenic gases. Examples include:
The general rule is that one unit volume of liquid will expand to approximately 800 unit volumes of gas at Standard temperature and pressure with some variation due to intermolecular force and molecule size compared to an ideal gas. Normal high pressure gas cylinders or bottles will hold from 200 to 400 atmosphere (unit)s. The atmosphere units pressure held by the bottle is equivalent to the number of volumes of standard temperature and pressure of the gas held by the bottle for an ideal gas.
Because the contents are under high pressure and are sometimes hazardous, there are special safety regulations for handling bottled gases. These include chaining bottles to prevent falling and breaking, proper ventilation to prevent injury or death in case of leaks and signage to indicate the potential hazards.
In the United States, the Compressed Gas Association sells a number of booklets and pamphlets on safe handling and use of bottled gases. (Members of the CGA can get the pamphlets for free.) The European Industrial Gases Association and the British Compressed Gas Association provide similar facilities in Europe and the United Kingdom.
In the United States, 'bottled gas' typically refers to liquefied petroleum gas. 'Bottled gas' is sometimes used in medical supply, especially for portable oxygen tanks. Packaged industrial gases are frequently called 'cylinder gas', though 'bottled gas' is sometimes used.
The United Kingdom and other parts of Europe more commonly refer to 'bottled gas' when discussing any usage whether industrial, medical or liquified petroleum. However, in contrast, what the United States calls liquified petroleum gas is known generically in the United Kingdom as 'LPG'; and it may be ordered using by one of several Trade names, or specifically as butane or propane depending on the required heat output.
Different countries have different gas colour codes but attempts are being made to standardise the colours of cylinder shoulders.
The colours below are specific shades, defined in the European Standard[1][2][3] in terms of RAL coordinates:
Diving cylinders are left unpainted (for aluminium), or painted to prevent corrosion (for steel), often in bright colors, most often yellow, to increase visibility. This should not be confused with industrial gases, where yellow shoulder means chlorine.
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
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