| helium 3 |
ABBR: 3 He. An isotope of helium whose nucleus contains two protons and a single neutron. Helium 3 is a stable gas. The isotope is polarizable, making it suitable as a gaseous contrast agent for use in magnetic resonance ima
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| helium-neon l. |
a laser with a mixture of ionized helium and neon gases as the active medium whose beam is in the red visible light spectrum at 633 nm; used as a guiding beam for lasers operating at nonvisible wavelengths.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| helium |
An element with atomic number 2; symbol: He. It is the second most common element in the Sun and outer planets, but rare on the rocky planets.
출처: www.psrd.hawaii.edu/PSRDglossary.html
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| helium |
The second lightest and second most abundant element. The typical helium atom consists of a nucleus of two protons and two neutrons surrounded by two electrons. Helium was first discovered in our Sun. Roughly 25 percent of our Sun is helium.
출처: www.bjp.org.cn/apod/glossary.htm
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| helium |
A colorless, odorless gas. It is the 2nd most abundant element in the universe.
출처: www.bigbangband.biz/glossary.html
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