envelope gas

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• Gas-discharge lamp — See also: Gas filled tube Germicidal lamps are simple low pressure mercury vapor discharges in a fused quartz envelope. Gas discharge lamps are a family of artificial light sources that generate light by sending an electrical discharge through an …   Wikipedia

• envelope — ► NOUN 1) a flat paper container with a sealable flap, used to enclose a letter or document. 2) a covering or containing structure or layer. 3) the outer housing of a vacuum tube, electric light, etc. 4) the structure within a balloon or non… …   English terms dictionary

• envelope — [än′və lōp΄, en′′və lōp΄] n. [Fr & OFr enveloppe < OFr envoluper: see ENVELOP] 1. a thing that envelops; wrapper; covering 2. a folded paper container as for a letter, usually with a gummed flap for sealing 3. a) the outer covering of a rigid… …   English World dictionary

• Envelope (disambiguation) — An envelope is the paper container used to hold a letter being sent by post.Envelope may also refer to:In science: * Envelope (mathematics), a curve, surface, or higher dimensional object defined as being tangent to a given family of lines or… …   Wikipedia

• gas — gasless, adj. /gas/, n., pl. gases, v., gassed, gassing. n. 1. Physics. a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid. 2. any such fluid or mixture of fluids. 3. any… …   Universalium

• Gas-filled tube — See also: Gas discharge lamp A gas filled tube, also known as a discharge tube, is an arrangement of electrodes in a gas within an insulating, temperature resistant envelope. Although the envelope is typically glass, power tubes often use… …   Wikipedia

• Gas compressor — A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume. Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. As gases are… …   Wikipedia

• envelope — noun Date: circa 1714 1. a flat usually paper container (as for a letter) 2. something that envelops ; wrapper < the envelope of air around the earth > 3. a. the outer covering of an aerostat b. the bag containing the gas in a balloon or airship… …   New Collegiate Dictionary

• gas tube — noun : an electron tube containing gas at a low pressure sufficient to influence the electrical performance of the tube * * * an electron tube the envelope of which contains a highly rarefied gas. Also called discharge tube. [1805 15] …   Useful english dictionary

• gas tube — an electron tube the envelope of which contains a highly rarefied gas. Also called discharge tube. [1805 15] * * * …   Universalium

• envelope — n. 1 a folded paper container, usu. with a sealable flap, for a letter etc. 2 a wrapper or covering. 3 the structure within a balloon or airship containing the gas. 4 the outer metal or glass housing of a vacuum tube, electric light, etc. 5… …   Useful english dictionary