第二个基础是由于托里切利在早期气压计方面的研究，人们对大气压已有所了解。
The second root was the understanding of air pressure which came from Torricelli's work on early barometers.
托里切利在水银气压计方面的研究表明大气的压力可以让气压计中的水银柱上升30多英尺。
Torricelli's work on water barometers showed that the pressure of the atmosphere could balance a column of water just over30feet in height.
托里切利在水银气压计方面的研究表明大气的压力可以让气压计中的水银柱上升30多英尺。
Torricelli's work on water barometers showed that the pressure of the atmosphere could balance a column of water just over 30 feet in height.
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