A vacuum formed above the column of mercury in a mercury barometer.
托里切利真空（水银气压计中水银柱上面的真空）
Example sentencesExamples
Make two nested fields, then shrink the internal one to produce a Torricellian vacuum between the two fields.
As early as 1670, a French scientist, observed a bluish phosphorescence in the Torricellian vacuum of a barometer, after the mercury column had been shaken up and down.
I was concerned however, that the air at the top of the upright would be at a very low pressure, (Torricellian vacuum), and hence a regular airpump would not work.
It was the first man-made vacuum, and, thanks to the publicity given the experiment, is called a Torricellian vacuum to this day.