# Talk:Pressure altitude

Latest comment: 1 year ago by R. J. Mathar in topic Inverse formula unclear or incorrect

## Is this term used outside of aviation ?

eg. in meteorology ? Article needs experts to clarify ? - Rod57 (talk) 20:03, 17 November 2015 (UTC)

## Airship

Can an airship or balloon be said to have a pressure altitude (as in LZ 129 Hindenburg#First commercial passenger flight) ? - Rod57 (talk) 20:03, 17 November 2015 (UTC)

## confusing usage

The article mentions that QNE is used for landing in unusual conditions where the altimeter setting exceeds specific values. However QNH and QFE are way more frequent for that purpose. QNE is really the pressure altitude used for (high) flight levels, which is also mentioned in the article. Wouldn't it be better to remove the sentence "In other words, it is the pressure altitude at the landing runway threshold." because this is basically never used? What would be a typical example of an airport that uses QNE for landing? — Preceding unsigned comment added by 87.190.2.100 (talk) 10:47, 7 December 2020 (UTC)

## Inverse formula unclear or incorrect

It is unclear how this has been derived, and I was unable to get a correct pressure using this formula.

It appears a correct inversion of the formula is: Pressure in hPa = 6.83679 * 10^-25 * (145,366.45 - h)^100/19

where h is altitude in feet. Ownself (talk) 23:23, 15 September 2022 (UTC)

You convert the altitude from feet to meter, divide both sides of the given equation by the altitude, move the expression with the 0.19th power on one side, raise both sides to the 5.25th power (obviously 0.190*5.255=1) and finally multiply both sides by 1013.25 hPa. R. J. Mathar (talk) 19:31, 18 September 2022 (UTC)