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Apr 22

# What is density altitude?

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Apr 22
Density altitude is the altitude at which the density of the air is equal to the standard atmospheric density at sea level. It is a measure of the density of the air in relation to its pressure and temperature, and is used in aviation to calculate aircraft performance. High density altitude can affect aircraft performance, as the reduced air density can result in decreased engine power and lift.
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Apr 22
Density altitude is the altitude above sea level at which the air density is equal to the air density at a given altitude. It is used to calculate the performance of aircraft, as the air density affects the aircraft's lift and drag.

Density altitude is calculated using the following formula:

$$DA=PA+(TS-SA)\times120$$

where:

- DA is the density altitude in feet
- PA is the pressure altitude in feet
- TS is the standard temperature at the pressure altitude in degrees Celsius
- SA is the actual temperature at the pressure altitude in degrees Celsius

The standard temperature at sea level is 15 degrees Celsius, and the standard temperature lapse rate is 6.4 degrees Celsius per 1,000 feet. This means that the temperature decreases by 6.4 degrees Celsius for every 1,000 feet of altitude.

The actual temperature at a given altitude can be measured using a thermometer. However, it is also possible to estimate the actual temperature using the following formula:

$$TA=TS+(DA-PA)\times6.4$$

where:

- TA is the actual temperature in degrees Celsius
- TS is the standard temperature at the pressure altitude in degrees Celsius
- DA is the density altitude in feet
- PA is the pressure altitude in feet

Density altitude is an important factor to consider when flying an aircraft. A higher density altitude will result in a lower air density, which will in turn reduce the aircraft's lift and increase its drag. This can make it more difficult to take off and land, and can also reduce the aircraft's performance in flight.

Density altitude is also a factor in the calculation of fuel burn. A higher density altitude will result in a higher fuel burn, as the aircraft's engines will need to work harder to overcome the increased drag.
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