It should enter and should rise in a column high enough to make equilibrium with the weight of the external air which forces it up?

Evangelista Torricelli

The Geometer has the special privilege to carry out, by abstraction, all constructions by means of the intellect.

Evangelista Torricelli

Is it a surprise that into the vessel, in which the mercury has no inclination and no repugnance, not even the slightest, to being there.

Evangelista Torricelli

Winds are produced by differences of air temperature, and hence density, between two regions of earth.

Evangelista Torricelli

We have made many glass vessels... with tubes two cubits long. These were filled with mercury, the open end was closed with the finger, and the tubes were then inverted in a vessel where there was mercury.

Evangelista Torricelli

Who, then, would wish to prevent me from freely considering figures hanging on a balance imagined to be at an infinite distance beyond the confines of the world?

Evangelista Torricelli

Many have argued that a vacuum does not exist, others claim it exists only with difficulty in spite of the repugnance of nature; I know of no one who claims it easily exists without any resistance from nature.

Evangelista Torricelli

I claim that the force which keeps the mercury from falling is external and that the force comes from outside the tube.

Evangelista Torricelli

On the surface of the mercury which is in the bowl rests the weight of a column of fifty miles of air.

Evangelista Torricelli

We saw that an empty space was formed and that nothing happened in the vessel where this space was formed.

Evangelista Torricelli