enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Pressure altitude - Wikipedia

    en.wikipedia.org/wiki/Pressure_altitude

    Aircraft Mode “C” transponders report the pressure altitude to air traffic control; corrections for atmospheric pressure variations are applied by the recipient of the data. The relationship between static pressure and pressure altitude is defined in terms of properties of the ISA.

  3. Scale height - Wikipedia

    en.wikipedia.org/wiki/Scale_height

    The pressure (force per unit area) at a given altitude is a result of the weight of the overlying atmosphere. If at a height of z the atmosphere has density ρ and pressure P, then moving upwards an infinitesimally small height dz will decrease the pressure by amount dP, equal to the weight of a layer of atmosphere of thickness dz.

  4. Table of specific heat capacities - Wikipedia

    en.wikipedia.org/wiki/Table_of_specific_heat...

    A Assuming an altitude of 194 metres above mean sea level (the worldwide median altitude of human habitation), an indoor temperature of 23 °C, a dewpoint of 9 °C (40.85% relative humidity), and 760 mmHg sea level–corrected barometric pressure (molar water vapor content = 1.16%). B Calculated values *Derived data by calculation.

  5. Pressure altimeter - Wikipedia

    en.wikipedia.org/wiki/Pressure_altimeter

    The greater the altitude, the lower the pressure. When a barometer is supplied with a nonlinear calibration so as to indicate altitude, the instrument is a type of altimeter called a pressure altimeter or barometric altimeter. A pressure altimeter is the altimeter found in most aircraft, and skydivers use wrist-mounted versions for similar ...

  6. QFF - Wikipedia

    en.wikipedia.org/wiki/QFF

    QFF is derived from the barometric pressure at the station location by calculating the weight of an imaginary air column, extending from the location to sea level, assuming the temperature and relative humidity at the location are the long term monthly mean, the temperature lapse rate is according to ISA and the relative humidity lapse rate is ...

  7. Vapor pressures of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Vapor_pressures_of_the...

    Values are given in terms of temperature necessary to reach the specified pressure. Valid results within the quoted ranges from most equations are included in the table for comparison. A conversion factor is included into the original first coefficients of the equations to provide the pressure in pascals (CR2: 5.006, SMI: -0.875).

  8. What should you set your heat to in the winter? Avoid ... - AOL

    www.aol.com/set-heat-winter-avoid-thermostat...

    Space heaters can help, but use with caution Many homeowners may be tempted to rely on fireplaces, space heaters, electric blankets and wood-burning stoves to keep warm in the winter.

  9. Psychrometrics - Wikipedia

    en.wikipedia.org/wiki/Psychrometrics

    Changes in state, such as when two air streams mix, can be modeled easily and somewhat graphically using the correct psychrometric chart for the location's air pressure or elevation relative to sea level. For locations at not more than 2000 ft (600 m) of altitude it is common practice to use the sea-level psychrometric chart.