I would like to know the (math.) formula to calculate air pressure at a certain height (like minus 3 km)?

Question

I want to find out atmospheric pressure in different parts of the Mediterranean (a map) , during the Messinian salinity crisis 51/2 million years ago, when the Gibraltar strait closed up and all the water evaporated in 1500 years. ( it stayed dry for 100. 000 years, with periodical flooding)

Answer 1

For the altitudes you'll be working with, the following rule of thumb will be precise enough:

In millibars, the correction is 1 millibar for each 8 meters of altitude gain or loss. Assume sea level at 1013.2 millibars standard.

Answer 2

The pressure change will be close to +/-1 " Hg for every
+/- 1000 ft. change in altitude ref. sea level. However it is not a linear function. With decreasing altitude (air depth below sea level) the rate of change will include an addition of about a 15% more increase in pressure per each additional 2,000 ft. due to the increased density of the air from compression.
The temperature will also rise. The pressure beginning at sea level is 29.921 "Hg.

Answer 3

properly you may probable elect to first locate the courting between the two gadgets: 1soccer ball : 5 tennis balls. Now you elect to detect the quantity of one tennis ball and multiply it via 5 to detect the quantity of the soccer ball, after which you elect to divide that answer via 3.14 and then from there multiply the respond via 3/4, and finally verify what extensive style prolonged via itself thrice equals that. For the 2d basically get the section for between the table tennis balls and divide 763.4 via that cost, and you have your answer. i'm in basic terms in Algebra, and for what i be conscious of suited now all i can inform you is that those issues are particularly basic.