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:
“A disposition to preserve, and an ability to improve, taken together, would be my standard of a statesman.”
—Edmund Burke (1729–1797)
“The day is not purer than the depths of my heart.”
—Jean Racine (1639–1699)
“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)