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  2. Hvat - Wikipedia

    en.wikipedia.org/wiki/Hvat

    Square hvat is used as the basis for other units of surface in the hvat system. motika; one motika = 200 square hvats = 719.3304 square meters.; jutro ("morning", compare the unit Morgen) or Joch in Austria; one jutro = 8 motika = 1,600 square hvats [1] = 5,754.6432 square meters.

  3. Barrer - Wikipedia

    en.wikipedia.org/wiki/Barrer

    The cm corresponds in the permeability equations to the thickness of the material whose permeability is being evaluated, the cm 3 STP cm2 s −1 to the flux of gas through the material, and the cmHg to the pressure drop across the material. That is, it measures the rate of fluid flow passing through an area of material with a thickness ...

  4. Pressure system - Wikipedia

    en.wikipedia.org/wiki/Pressure_system

    A pressure system is a peak or lull in the sea level pressure distribution, a feature of synoptic-scale weather. The surface pressure at sea level varies minimally, with the lowest value measured 87 kilopascals (26 inHg) and the highest recorded 108.57 kilopascals (32.06 inHg).

  5. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    NO x concentration = 10 parts per million by volume = 10 ppmv = 10 volumes/10 6 volumes NO x molar mass = 46 kg/kmol = 46 g/mol Flow rate of flue gas = 20 cubic metres per minute = 20 m 3 /min The flue gas exits the furnace at 0 °C temperature and 101.325 kPa absolute pressure.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Dynamic pressure - Wikipedia

    en.wikipedia.org/wiki/Dynamic_pressure

    In fluid dynamics, dynamic pressure (denoted by q or Q and sometimes called velocity pressure) is the quantity defined by: [1] = where (in SI units): q is the dynamic pressure in pascals (i.e., N/m 2, ρ (Greek letter rho) is the fluid mass density (e.g. in kg/m 3), and; u is the flow speed in m/s.

  8. Hagen–Poiseuille equation - Wikipedia

    en.wikipedia.org/wiki/Hagen–Poiseuille_equation

    Since u needs to be finite at r = 0, c 1 = 0. The no slip boundary condition at the pipe wall requires that u = 0 at r = R (radius of the pipe), which yields c 2 = ⁠ GR 2 / 4μ ⁠. Thus we have finally the following parabolic velocity profile: = ().

  9. SI derived unit - Wikipedia

    en.wikipedia.org/wiki/SI_derived_unit

    SI derived units are units of measurement derived from the seven SI base units specified by the International System of Units (SI). They can be expressed as a product (or ratio) of one or more of the base units, possibly scaled by an appropriate power of exponentiation (see: Buckingham π theorem).