A vacuum formed above the column of mercury in a mercury barometer.
- ‘Make two nested fields, then shrink the internal one to produce a Torricellian vacuum between the two fields.’
- ‘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.’
- ‘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.’