Helium - Law Dictionary Search Results
Home Dictionary Name: heliumHelium
An inert monoatomic gaseous element occurring in the atmosphere of the sun and stars and in small quantities in the earths atmosphere in several minerals and in certain mineral waters It is obtained from natural gas in industrial quantities Symbol He atomic number 2 at wt 40026 C12011 Helium was first detected spectroscopically in the sun by Lockyer in 1868 it was first prepared by Ramsay in 1895 Helium has a density of 198 compared with hydrogen and is more difficult to liquefy than the latter Chemically it is an inert noble gas belonging to the argon group and cannot be made to form compounds The helium nucleus is the charged particle which constitutes alpha rays and helium is therefore formed as a decomposition product of certain radioactive substances such as radium The normal helium nucleus has two protons and two neutrons but an isotope with only one neutron is also observed in atmospheric helium at an abundance of 0013 Liquid helium has a boiling point of 2689deg C at atmospheri...
Caisson disease
A disease frequently induced by remaining for some time in an atmosphere of high pressure as in caissons diving bells etc It is characterized by neuralgic pains and paralytic symptoms It is caused by the release of bubbles of gas usually nitrogen from bodily fluids into the blood and tissues when a person having been in an environment with high air pressure moves to a lower pressure environment too rapidly for the excess dissolved gases to be released through normal breathing It may be fatal but can be reversed or alleviated by returning the affected person to a high air pressure and then gradually decreasing the pressure to allow the gases to be released from the body fluids It is a danger well known to divers It is also called the bends and decompression sickness It can be prevented in divers by a slow return to normal pressure or by using a breathing mixture of oxygen combined with a gas having low solubility in water such as helium...
H bomb
The hydrogen bomb a thermonuclear weapon that releases atomic energy by union of hydrogen nuclei at high temperatures to form helium The force of its explosion may range from one to hundreds of megatons of TNT equivalent...
natural gas
The combustible gas found associated with petroleum deposits and also in other geological formations comprised predominantly of methane plus variable other constitutents It is an important source of energy and is transported long distances by pipelines or in a liquefied state in tankers for commercial distribution Some natural gas deposits contain helium and comprise the primary source of that rare element...
Petroleum
Petroleum, includes any mineral oil or relative hydrocarbon and natural gas existing in its natural condition in strata, but does not include coal or bituminous shales or other shales or other stratified deposits from which oil can be extracted by destructive distillation. [Petroleum (Production) Act, 1934 (UK)]Includes any mineral oil or relative hydrocarbon and natural gas existing in its natural condition in strata, whether or not it has undergone any processing; but does not include coal or bituminous shales or other stratified deposits from which oil can be extracted by destructive distillation. [Pipelines Act, 1962 (UK)]Petroleum, is an oily, inflammable liquid made up mostly of hydrocarbons compounds containing only hydrogen and carbon, the New Bank of Popular Science, Vol. 2; Special Reference No. 1 of 2001, In Re (2004) 4 SCC 489.Means liquid and gaseous hydrocarbons are so intimately associated in nature that it has become customary to shorten the expression 'petroleum and na...
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