Brooke Jarvis considers the history behind the search for sea level, as described in a new book by Wilko Graf von Hardenberg, and probes what it tells us about science, global warming, and life on ...

Since we know that at sea level the standard conditions are 29.92 inHg/1013.4 millibar and 59 degrees Fahrenheit/15 C, we can use the following formula to calculate pressure altitude: ...