This refers to the level of oxygen present in the air at that altitude with the temperature at 60 degrees F, with a standard pressure of 29.92, and dry air, or zero percent humidity.

Bosch Sensortec has launched a barometric pressure sensor for smartphones, wearable and hearable devices. The BMP390 delivers altitude tracking in smartphones as well as wearable and hearable devices.

Surface chart of the cyclone that resulted in the lowest barometric pressure ever measured in the United Kingdom; 925.6 mb at Ochtertyre in Scotland on January 26, 1884.