water-vapor diffusion

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• Vapor barrier — 6 mil Polyethylene plastic sheet as vapor barrier between insulation and gypsum board …   Wikipedia

• Diffusion —   The movement of individual molecules through a material; permeation of water vapor through a material …   Energy terms

• Moisture vapor transmission rate — (MVTR), also water vapor transmission rate (WVTR), is a measure of the passage of water vapor through a substance. There are many industries where moisture control is critical. Moisture sensitive foods and pharmeceuticals are put in packaging… …   Wikipedia

• Diffusion pump — Six inch oil diffusion pump. Diffusion pumps use a high speed jet of vapor to direct gas molecules in the pump throat down into the bottom of the pump and out the exhaust. Presented in 1915 by Wolfgang Gaede[1] and using mercury vapor, they were… …   Wikipedia

• Water pipe percolator — A water pipe percolator is a small additional sub chamber within the main chamber of a water pipe that provides in line smoke water interaction via heat exchange and dissolution.Function and PurposeA percolator works by utilizing a pressure… …   Wikipedia

• diffusion — /di fyooh zheuhn/, n. 1. act of diffusing; state of being diffused. 2. prolixity of speech or writing; discursiveness. 3. Physics. a. Also called migration. an intermingling of molecules, ions, etc., resulting from random thermal agitation, as in …   Universalium

• Dynamic vapor sorption — (DVS) is a gravimetric technique that measures how quickly and how much of a solvent is absorbed by a sample: such as a dry powder absorbing water. It does this by varying the vapor concentration surrounding the sample and measuring the change in …   Wikipedia

• Lunar water — Composite image of the Moon s south polar region, captured by NASA s Clementine probe over two lunar days. Permanently shadowed areas could harbour water ice. Lunar water is water that is present on the Moon. Liquid water cannot persist at the… …   Wikipedia

• Supercritical water oxidation — or SCWO is a process that occurs in water at temperatures and pressures above a mixture s thermodynamic critical point. Under these conditions water becomes a fluid with unique properties that can be used to advantage in the destruction of… …   Wikipedia

• Superheated water — is liquid water under pressure at temperatures between the usual boiling point (100°C) and the critical temperature (374°C). It is also known as subcritical water and pressurised hot water. Superheated water referred to in this article is stable… …   Wikipedia

• Permeation — Permeation, in physics and engineering, is the penetration of a permeate (such as a liquid, gas, or vapor) through a solid, and is related to a material s intrinsic permeability. Permeability is tested by permeation measurement, for example by a… …   Wikipedia