bright spot
bright spot A characteristic phase reversal on a reflection event, usually indicating the presence of gas. The phase reversal is caused by a marked decrease in the acoustic impedence of gas-filled material which causes a strong negative reflection from the top of the gas-filled unit. Often this is accompanied by a flat spot below.
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Since ancient times, use of poison has been considered treacherous and, therefore, incompatible with honorable conduct in war. Yet, the history o… Tokyo Gas Co. Ltd , Tokyo Gas Co., Ltd.
1-5-20 Kaigan
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Public Company
Incorporated: 1885
Employees: 12,519
Sa… Helium , Helium
Background
Helium is one of the basic chemical elements. In its natural state, helium is a colorless gas known for its low density and low che… Natural Gas , Natural gas is a fossil fuel. Most scientists believe natural gas was created by the same forces that formed oil, another fossil fuel. In prehistoric… Mustard Gas , Among the toxic agents that can injure or kill people are noxious gases. One example is mustard gas. Its use as an offensive chemical weapon makes mu…
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