随着海拔高度的增加，大气压降低，氧分压随之下降，低压缺氧成为危害机体机能活动的主要因素。
As altitude increasing, air pressure as well as oxygen pressure does decrease. Hypobaric hypoxia has become the main factor of interfering with life activity.
海拔每上升1000米大气压力- - -也就是空气密度- - -会降低大概11%(虽然精确的公式比这要更复杂。)
Every 1000 metres increase in altitude reduces atmospheric pressure - and hence the density of the air - by about 11 per cent (though the precise formula is more complicated than this).
当外界压强低于一个大气压时，水的沸点就降低。
When the external pressure is below atmospheric pressure, the boiling point will be lower .
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