earth sciences and ecology question #912



DeeCee, a 46 year old male from Indianapolis asks on September 9, 2002,

Q:

Is there a standard formula that will convert altitude into pressure? I'm interested in altitude from sea level to approx. 500,000 feet. I would like to input this formula into a spreadsheet program.

viewed 14284 times

the answer

Barry Shell answered on September 15, 2002, A:

A rule of thumb for altimeter correction is that the pressure drops about 1 inch of mercury for each 1,000 foot altitude gain. If you're using millibars, the correction is 1 millibar for each 8 meters of altitude gain. These rules of thumb work pretty well for elevations or altitudes of less than a two or three thousand feet.

For more details and a formula for your spreadsheet use Google to search the web. Many places have this answer, such as http://www.usatoday.com/weather/wbarocx.htm (scroll down the page).

Add to or comment on this answer using the form below.
(required)
(required if you would like a response)
Note: All submissions are moderated prior to posting.
If you found this answer useful, please consider making a small donation to science.ca.