Calculating Density Alttitude of Air knoing temp/baro/humidity?

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    Air Density
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Discussion Overview

The discussion revolves around calculating the density altitude of air using known parameters such as temperature, barometric pressure, and humidity. Participants explore the necessary data and formulas required for this calculation, focusing on both theoretical and practical aspects.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Homework-related

Main Points Raised

  • One participant inquires whether additional data is needed to calculate density altitude given the temperature, barometric pressure, and humidity.
  • Another participant suggests using online calculators and emphasizes the need to calculate dewpoint temperature first before determining density altitude.
  • A participant expresses a preference for a formula over a calculator, seeking the specific formula for calculating dewpoint from temperature and relative humidity, and subsequently for density altitude.
  • One response reiterates that formulas are available on the suggested website and mentions that some reports may already include dewpoint temperature.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to calculate density altitude, with some advocating for calculators and others for formulas. The discussion remains unresolved regarding the specific formulas needed.

Contextual Notes

There is a lack of clarity on the exact formulas for calculating dewpoint and density altitude, as well as the assumptions underlying their application. The discussion also reflects a dependence on external resources for these calculations.

soundengineer
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I'm trying to figure out the Density Altitude of Air
Known data
Temp 70*F
Barometric Pressure 30inHg
Humidity 35%

do I need more data or can I calculet it from this?
 
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There are many calculators available to do this. One is at:
http://www.srh.noaa.gov/epz/wxcalc/wxcalc.shtml
With this one you need to calculate Dewpoint temp first using the first moisture calculator then calculate the density altitude.
BTW humidity when it is in a % is relative humidity.
 
Last edited by a moderator:
nucleus said:
There are many calculators available to do this. One is at:
http://www.srh.noaa.gov/epz/wxcalc/wxcalc.shtml
With this one you need to calculate Dewpoint temp first using the first moisture calculator then calculate the density altitude.
BTW humidity when it is in a % is relative humidity.

I need an actual formula...not a calculator
calculator doesn't do me any good in an excel spreadsheet...

so what's the formula for dewpoint with known temperature and relative humidity
and then once I have dewpoint how do I get to Density Altitude?
 
Last edited by a moderator:
The formulas are on the site I gave you. There are also spreadsheets on the net that do what you want to do.
As for Td some reports already include it.
 

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