Atm
Atm is a unit of pressure. It stands for Earth atmospheres at sea level. So, 1 atm is the pressure at 0 m above sea level.
A quick conversion between the SI unit of pressure, the pascal, and the atm is:
$9.8692×10^{−6}$ (Error compiling LaTeX. Unknown error_msg) atm = 1 Pa 101,325 Pa = 1 atm
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