Torricellian

a.
  1. Of or pertaining to Torricelli, an Italian philosopher and mathematician, who, in 1643, discovered that the rise of a liquid in a tube, as in the barometer, is due to atmospheric pressure. See Barometer.
    2. Torricellian tube ,
    a glass tube thirty or more inches in length, open at the lower end and hermetically sealed at the upper, such as is used in the barometer.
    Torricellian vacuum (Physics),
    a vacuum produced by filling with a fluid, as mercury, a tube hermetically closed at one end, and, after immersing the other end in a vessel of the same fluid, allowing the inclosed fluid to descend till it is counterbalanced by the pressure of the atmosphere, as in the barometer.