y l = 9.80665 k g {\displaystyle 1hyl=9.80665kg} 压强的单位为工程大气压(英语:Technicalatmosphere)(at)。 1 k g f {\displaystyle 1kgf} 的力作用于 1 c m 2 {\displaystyle 1cm^{2}}
; Sternberg, H. Monitoring of the refraction coefficient of the lower atmosphere using a controlled set-up of simultaneous reciprocal vertical angle measurements