Standard Day - Standard Day Parameters

Standard Day Parameters

For Pilots: At sea level, Altimeter:29.92 at 59 degrees F(15degreesCelcius) The "standard day" model of the atmosphere is defined at sea level, with certain present conditions such as temperature and pressure. But other factors, such as humidity, further alter the nature of the atmosphere, and are also defined under standard day conditions:

  • Density (ρ): 1.229 kg/m³ (0.00237 slug/ft3)
  • Pressure (p): 101.3 kPa (14.7 lb/ in2)
  • Temperature (T): 15 °C (59 °F)
  • Viscosity (μ): 17.3 µPa·s (3.62 × 10-7 lb s/ft2)

The first three properties are usually referred as "standard day" conditions, which the viscosity aspect is largely ignored throughout the aviation community. However, viscosity, which is affected by humidity levels, plays a key role in aerodynamic drag, which is why it is a key component of standard day conditions. Because it is a key component of drag, it affects the amount of fuel burned per unit of distance travelled.

Read more about this topic:  Standard Day

Famous quotes containing the words standard, day and/or parameters:

    The art of advertisement, after the American manner, has introduced into all our life such a lavish use of superlatives, that no standard of value whatever is intact.
    Wyndham Lewis (1882–1957)

    How selfhood begins with a walking away,
    And love is proved in the letting go.
    —C. Day Lewis (20th century)

    Men have defined the parameters of every subject. All feminist arguments, however radical in intent or consequence, are with or against assertions or premises implicit in the male system, which is made credible or authentic by the power of men to name.
    Andrea Dworkin (b. 1946)