Chapter 5.5 - Pressure, Temperature and Density Flashcards
What are the main elements to Air Density?
- Temperature.
- Pressure.
What does ISA stand for?
International Standard Atmosphere.
A decrease in pressure causes an (increase/decrease) to density?
Decrease.
A decrease in temperature causes an (increase/decrease) in density?
Increase.
Density (increases/decreases) with Height?
Decreases.
Which rate of decrease is higher with Height (Temperature/Pressure)?
Pressure.
What is the ISA MSL Pressure?
1013 hPa.
What is the ISA MSL Temperature?
+15°C.
What is the ISA Pressure Lapse Rate (2)?
- 30 feet is 1 hPa.
- 1000 feet is 30 hPa.
What is the ISA Temperature Lapse Rate?
-2°C for every 1000 feet.
What does PH stand for?
Pressure Height.
Define PH?
The Height above sea level in the ISA.
How does a Pilot find the Pressure Height using the Altimeter?
By setting 1013 hPa in the pressure-setting datum.
True or False. If the pressure is higher than 1013 hPa, the calculation is to increase the difference?
False. Decrease.
True or False. If the pressure is lower than 1013 hPa, the calculation is to increase the difference?
True.
If an Aircraft is at 3000 feet with the pressure-setting datum set at 1003 hPa. What would be the Pressure Height?
3300 feet.
If an Aircraft is at 3000 feet with the pressure-setting datum set at 1023 hPa. What would be the Pressure Height?
2700 feet.
How can the Pressure Height be calculated without the use of an Altimeter (2)?
- QNH.
- Altitude/Elevation.
How can QNH be obtained (2)?
- Aerodrome Forecast (TAF).
- Area Forecast (ARFOR).
How can a Pilot find Temperature in the Cockpit?
Outside Air Temperature gauge (OAT).
How can a Pilot find Temperature outside the Cockpit (2)?
- Aerodrome Forecast (TAF).
- Area Forecast (ARFOR).
How do you convert °C to °F (3)?
- Divide °C by 5.
- Multiple this by 9.
- Add 32.
How do you convert °F to °C (3)?
- Subtract 32 from °F.
- Multiple this by 5.
- Divide this by 9.
What does DH stand for?
Density Height.
