standard unit of permeability

См. также в других словарях:

• permeability — /perr mee euh bil i tee/, n. 1. the property or state of being permeable. 2. Also called magnetic permeability. Elect. a measure of the change in magnetic induction produced when a magnetic material replaces air, expressed as a coefficient or a… …   Universalium

• laboratory coefficient of permeability —    , standard coefficient of permeability    Permeability defined for controlled temperature conditions (60NF) as gallons per day per square foot (gpd/ft2) under a unit gradient [16]. See also Meinzer unit …   Lexicon of Cave and Karst Terminology

• Conventional electrical unit — A conventional electrical unit (is also know as a electrical symbol) (or simply conventional unit where there is no risk of ambiguity) is a unit of measurement in the field of electricity which is based on the conventional values of the Josephson …   Wikipedia

• Perm (unit) — A perm is a unit of permeance or water vapor transmission given a certain differential in partial pressures on either side of a material or membrane.Definitions;US perm:The US perm is defined as 1 grain of water vapor per hour, per square foot,… …   Wikipedia

• Tesla (unit) — The tesla (symbol T) is the SI derived unit of magnetic field B (which is also known as magnetic flux density ). One tesla is equal to one weber per square meter, and it was defined in 1960[1] in honour of the inventor, physicist, and electrical… …   Wikipedia

• natural gas — a combustible mixture of gaseous hydrocarbons that accumulates in porous sedimentary rocks, esp. those yielding petroleum, consisting usually of over 80 percent methane together with minor amounts of ethane, propane, butane, nitrogen, and,… …   Universalium

• Darcy, Henri-Philibert-Gaspard — ▪ French engineer born June 10, 1803, Dijon, France died Jan. 3, 1858, Paris       French hydraulic engineer who first derived the equation (now known as Darcy s law) that governs the laminar (nonturbulent) flow of fluids in homogeneous, porous… …   Universalium

• magnetism — /mag ni tiz euhm/, n. 1. the properties of attraction possessed by magnets; the molecular properties common to magnets. 2. the agency producing magnetic phenomena. 3. the science dealing with magnetic phenomena. 4. strong attractive power or… …   Universalium

• Magnetic pole strength — (symbol: p) is a physical quantity used to measure the strength of the pole of a bar magnet (or a hypothetical magnetic monopole). If there is an infinitely long wire where the electric current is I, then the magnetic pole strength is defined as… …   Wikipedia

• Metamaterial antenna — This Z antenna tested at the National Institute of Standards and Technology is smaller than a standard antenna with comparable properties. Its high efficiency is derived from the Z element inside the square that acts as a metamaterial, greatly… …   Wikipedia

• Coaxial cable — RG 59 flexible coaxial cable composed of: A: outer plastic sheath B: woven copper shield C: inner dielectric insulator D: copper core Coaxial cable, or coax, has an inner conductor surrounded by a flexible, tubular insulating layer, surrounded by …   Wikipedia