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As of 2006, the most precise measurement of R had been obtained by measuring the speed of sound c a (P, T) in argon at the temperature T of the triple point of water at different pressures P, and extrapolating to the zero-pressure limit c a (0, T). The value of R is then obtained from the relation:
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Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. [10] Argon is the third most abundant ...
The R-value is the building industry term [3] for thermal resistance "per unit area." [4] It is sometimes denoted RSI-value if the SI units are used. [5] An R-value can be given for a material (e.g. for polyethylene foam), or for an assembly of materials (e.g. a wall or a window). In the case of materials, it is often expressed in terms of R ...
This is a list of refrigerants, sorted by their ASHRAE-designated numbers, commonly known as R numbers. Many modern refrigerants are human-made halogenated gases, ...
Adding argon gas increases the efficiency to about R-3. Using low emissivity glass on surface #2 will add another R-value. Properly designed triple-glazed IGUs with low emissivity coatings on surfaces #2 and #4 and filled with argon gas in the cavities. Certain multi-chambered IG units result in R-values as high as R-24.
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Volatiles that originate from deeper sources such as subcontinental lithospheric mantle (SCLM), have a 6.1± 0.9 R A [100] and mid-oceanic ridge basalts (MORB) display higher values (8 ± 1 R A). Mantle plume samples have even higher values than > 8 R A. [100] [101] Solar wind, which represent an unmodified primordial signature is reported to ...