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The vacuum magnetic permeability (variously vacuum permeability, permeability of free space, permeability of vacuum, magnetic constant) is the magnetic permeability in a classical vacuum. It is a physical constant , conventionally written as μ 0 (pronounced "mu nought" or "mu zero").
Another 5 properties in Charleston County outside Charleston were once listed but have been removed. Three properties and districts — the Ashley River Historic District , Ashley River Road , and the Secessionville Historic District — are split between the city and the other parts of the county, and are thus included on both lists.
September 12, 1994 (Roughly along the Ashley River from just east of South Carolina Highway 165 to the Seaboard Coast Line railroad bridge: West Ashley: Extends into other parts of Charleston and into Dorchester counties; boundary increase (listed October 22, 2010): Northwest of Charleston between the northeast bank of the Ashley River and the Ashley-Stono Canal and east of Delmar Highway ...
In SI units, permeability is measured in henries per meter (H/m), or equivalently in newtons per ampere squared (N/A 2). The permeability constant μ 0, also known as the magnetic constant or the permeability of free space, is the proportionality between magnetic induction and magnetizing force when forming a magnetic field in a classical vacuum.
A practical unit for permeability is the darcy (d), or more commonly the millidarcy (md) (1 d ≈ 10 −12 m 2). The name honors the French Engineer Henry Darcy who first described the flow of water through sand filters for potable water supply. Permeability values for most materials commonly range typically from a fraction to several thousand ...
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Old plaster was stripped off the walls and ceiling to get to the wooden studs and trusses. [141] Damaged pews, window sills, and shutters were repaired, the reredos was cleaned, and the roof and exterior trim were painted. [141] An oil heater was installed in the north transept by the door. [141]