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Moisture vapor transmission rate (MVTR), also water vapor transmission rate (WVTR), is a measure of the passage of water vapor through a substance.It is a measure of the permeability for vapor barriers.
They use fans to suck in the air, filter it, and either analyze it automatically there and then or collect and store it for later analysis in a laboratory. Active sensors use either physical or chemical methods. [8] Physical methods measure an air sample without changing it, for example, by seeing how much of a certain wavelength of light it ...
Stability in air and on exposure to X-rays; Ready availability; Low cost; Crystals with simple structures tend to give the best diffraction performance. Crystals containing heavy atoms can diffract well, but also fluoresce more in the higher energy region, causing interference.
Open the oven but also back away from it at the same time since the hot air escaping from the furnace can burn bare skin. Allow the oven and sample to cool down before removing the sample from the oven. Weigh the crucible with the sample again. Subtract the empty crucible weight from this new weight and that is the sample's dry weight.
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The teenager was exploring a Gold Rush-era mine shaft that was about six feet deep and 30 feet back when he fell and became stuck. After about 15 minutes, a friend who was with the teen called for ...
The clean air delivery rate (CADR) is a figure of merit that is the cubic feet per minute (CFM) of air that has had all the particles of a given size distribution removed. For air filters that have air flowing through them, it is the fraction of particles (of a particular size distribution) that have been removed from the air, multiplied by the ...
Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour. If the air in the space is either uniform or perfectly mixed, air changes per hour is a measure of how many times the air within a defined space is replaced each hour.