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  2. Useful conversions and formulas for air dispersion modeling

    en.wikipedia.org/wiki/Useful_conversions_and...

    = air pollutant concentration, in parts per million by volume mg/m 3 = milligrams of pollutant per cubic meter of air = atmospheric temperature in kelvins = 273.15 + °C 0.08205 = Universal Gas Law constant in atm·l/(mol·K) = molecular weight of the air pollutant (dimensionless)

  3. Standard cubic feet per minute - Wikipedia

    en.wikipedia.org/wiki/Standard_cubic_feet_per_minute

    For example, a mass flow rate of 1,000 kg/h of air at 1 atmosphere of absolute pressure is 455 SCFM when defined at 32 °F (0 °C) but 481 SCFM when defined at 60 °F (16 °C). Due to the variability of the definition and the consequences of ambiguity, it is best engineering practice to state what standard conditions are used when communicating ...

  4. Standard cubic foot - Wikipedia

    en.wikipedia.org/wiki/Standard_cubic_foot

    This regulation defines a standard cubic foot, for compressed or liquefied gases in refillable cylinders other than LPG by, "A standard cubic foot of gas is defined as a cubic foot at a temperature of 21 °C (70 °F) and a pressure of 101.325 kilopascals [kPa] (14.696 psia)".

  5. Help:Convert units - Wikipedia

    en.wikipedia.org/wiki/Help:Convert_units

    {{convert|123|cuyd|m3+board feet}} → 123 cubic yards (94 m 3; 40,000 board feet) The following converts a pressure to four output units. The precision is 1 (1 decimal place), and units are abbreviated and linked.

  6. Module:Convert/documentation/conversion data - Wikipedia

    en.wikipedia.org/wiki/Module:Convert/...

    cubic foot per day: cubic feet per day: m3/d: Cubic foot per second: cuft/h: cu ft/h: 28316846592e-12/3600: cubic foot per hour: cubic feet per hour: m3/h: Cubic foot per second: cuft/min: cu ft/min: 28316846592e-12/60: cubic foot per minute: cubic feet per minute: m3/min: Cubic foot per minute: cuft/s: cu ft/s: 28316846592e-12: cubic foot per ...

  7. A tiny and cheap device called a 'Glock switch' lets ... - AOL

    www.aol.com/news/tiny-cheap-device-called-glock...

    An ATF report on guns used in crimes found that the number of machine gun conversion devices seized by law enforcement went up 570% from 2017 to 2021, and officials say preliminary numbers from ...

  8. 3D printers turn regular guns into machine guns. Feds are ...

    www.aol.com/news/3d-printers-turn-regular-guns...

    Department of Justice officials announced national efforts Friday to crackdown on 3D-printed devices to convert guns to fire fully automatic.

  9. Air pollutant concentrations - Wikipedia

    en.wikipedia.org/wiki/Air_pollutant_concentrations

    = milligrams of pollutant per cubic meter of air at sea level atmospheric pressure and T: ppmv = air pollutant concentration, in parts per million by volume T = ambient temperature in K = 273. + °C 0.082057338 = Universal gas constant in L atm mol −1 K −1: M = molecular mass (or molecular weight) of the air pollutant