perm-inch

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• perm inch —    a traditional unit of water vapor permeance. The perm value (see above) does not depend on the thickness of the material used as a water barrier.    The permeance is the product of the perm value and the thickness, measured in inches. One perm …   Dictionary of units of measurement

• Perm —   The measurement of water vapor through different materials measured in perm inch (mass of water vapor moving through a unit area in unit time).   California Energy Comission. Dictionary of Energy Terms …   Energy terms

• 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

• perm —    a traditional unit of water vapor permeability, that is, the ability of a material to permit the passage of water vapor. If we want to keep things dry, we wrap them in something having low permeability. A material has a permeability of one… …   Dictionary of units of measurement

• 6 inch siege gun M1904 — Infobox Weapon name=6 inch siege gun model 1904 caption=Russian siege gun model 1904 displayed in front of Coastal Artillery Museum in Suomenlinna fortress, Helsinki. origin=Russian Empire type=siege gun is ranged= is bladed= is explosive= is… …   Wikipedia

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

• Senecio congestus — Swamp Ragwort Scientific classification Kingdom: Plantae (u …   Wikipedia

• Abkürzungen/Luftfahrt/L–R — Dies ist der vierte Teil der Liste Abkürzungen/Luftfahrt. Liste der Abkürzungen Teil 1 A A Teil 2 B–D B; C; D Teil 3 E–K …   Deutsch Wikipedia

• geochronology — geochronologic /jee oh kron l oj ik/, geochronological, adj. geochronologist, n. /jee oh kreuh nol euh jee/, n. the chronology of the earth, as based on both absolute and relative methods of age determination. [1890 95; GEO + CHRONOLOGY] * * *… …   Universalium

• 152 mm howitzer M1909/30 — Infobox Weapon name=152 mm howitzer M1909/30 caption=M1909/30 in Hämeenlinna Artillery Museum, Finland. origin=USSR type=field howitzer is ranged= is bladed= is explosive= is artillery=yes is vehicle= is UK= service= used by= wars= designer=… …   Wikipedia

• hair — I (New American Roget s College Thesaurus) I n. mane (see hair); filament;bit, inch (see narrowness, nearness). II Body covering filament Nouns 1. hair; head of hair, mop, mane, crop of hair, thatch, shock; gray, silver or white hair (see… …   English dictionary for students