Now Reading: Torricelli’s mercury tube first measured atmospheric pressure
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Torricelli’s mercury tube first measured atmospheric pressure
In 1643, Evangelista Torricelli used a mercury-filled glass tube to measure atmospheric pressure, creating the first barometer. He inverted a 110, 120 cm tube of mercury into a basin; a column of…
The Story in Brief
In 1643, Evangelista Torricelli used a mercury-filled glass tube to measure atmospheric pressure, creating the first barometer. He inverted a 110, 120 cm tube of mercury into a basin; a column of about 76 cm remained. Torricelli argued the atmosphere's weight supported the column, describing humans living at the bottom of an 'ocean of air'. In a 1644 letter, he called it the first instrument for measuring barometric pressure.
Later, Blaise Pascal's brother-in-law carried a barometer up Puy-de-Dôme in France, finding substantially lower pressure at altitude. This confirmed Torricelli's prediction that pressure decreases with height. The experiment transformed the atmosphere from an abstract concept into something measurable, and von Guericke later demonstrated its force with vacuum experiments.
The Indian Opinion
The story of Torricelli is often told as a lone genius, but his work built on earlier thinkers like Galileo and Berti and was verified by Pascal. This collective effort reminds us that foundational discoveries are rarely instantaneous. The barometer's real value lies not in one experiment but in its consistent utility for weather prediction and altitude measurement. The test now: how many other such inventions from historical experiments remain overlooked, waiting to be rediscovered for practical use?
Source: timesofindia.indiatimes.com
This story was synthesised by AI from the source linked above.
