scale height
distance over which a quantity decreases by a factor of e; for a planetary atmosphere, the distance over which pressure drops by that factor
en-US/ˈskeɪl ˈhaɪt/
en-GB/ˈskeɪl ˈhaɪt/
distance over which a quantity decreases by a factor of e; for a planetary atmosphere, the distance over which pressure drops by that factor