helium vapor

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• vapor — I (New American Roget s College Thesaurus) Visible gas Nouns 1. vapor, vaporousness, vaporization, volatilization; gaseousness, gaseity; evaporation; distillation, aeration, sublimation, exhalation; fumigation, steaming; volatility. See… …   English dictionary for students

• Liquid helium — Helium exists in liquid form only at very low temperatures. The boiling point and critical point depend on the isotope of the helium; see the table below for values. The density of liquid helium at its boiling point and 1 atm is approximately… …   Wikipedia

• Superconducting Radio Frequency — (SRF) science and technology involves the application of electrical superconductors to radio frequency devices. The ultra low electrical loss of the superconductor yields RF resonators with extremely high quality factors, or Q . For example, it… …   Wikipedia

• International Temperature Scale of 1990 — The International Temperature Scale of 1990 (ITS 90) is an equipment calibration standard for making measurements on the Kelvin and Celsius temperature scales. ITS–90 is an approximation of the thermodynamic temperature scale that facilitates the …   Wikipedia

• Leiden scale — The Leiden scale was used to calibrate low temperature indirect measurements in the early twentieth century, by providing conventional values (in kelvins, then termed degrees Kelvin ) of helium vapour pressure. It was used below 183°C, the… …   Wikipedia

• Lighter than air — Some gases are buoyant in air because they have densities lower than that of air (about 1.2 kg/m3, 1.2 g/l). Lighter than air gases are used to fill craft called aerostats, which include free balloons, moored balloons, and airships, to make the… …   Wikipedia

• Spacecraft magnetometers — Magnetometers are one of the most widely used scientific instruments in exploratory and observation satellites. These instruments were instrumental in the discovery of the Van Allen radiation belts around Earth, discovered on the very first… …   Wikipedia

• 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

• Extraterrestrial atmospheres — The study of extraterrestrial atmospheres is an active field of research, [cite web| title=Department of Atmospheric Science, University of Washington | url=http://www.atmos.washington.edu/academic/planets.html | accessdate=2007 05 24] both as an …   Wikipedia

• Magnetometer — A magnetometer is a measuring instrument used to measure the strength or direction of a magnetic field either produced in the laboratory or existing in nature. Some countries such as the USA, Canada and Australia classify the more sensitive… …   Wikipedia

• Earth's atmosphere — ppmvThe composition figures above are by volume fraction (V%), which for ideal gases is equal to mole fraction (that is, the fraction of total molecules). Although the atmosphere is not an ideal gas, nonetheless the atmosphere behaves enough like …   Wikipedia