In Torricelli's experiment, why is atmospheric pressure (at the base of the mercury column) directed upwards? Based on Pascal's principle, shouldn't it be directed in all directions? - Quora
![Florin Perier measuring the height Barometer (mercury tube) of Evangelista Torricelli or Toricelli during the experiment Florin Perier measuring the height Barometer (mercury tube) of Evangelista Torricelli or Toricelli during the experiment](https://www.meisterdrucke.us/kunstwerke/1260px/Jean_Edouard_%281824_99%29_Dargent_-_Florin_Perier_measuring_the_height_Barometer_%28mercury_tube%29_of_Evangelista_Torri_-_%28MeisterDrucke-1067102%29.jpg)
Florin Perier measuring the height Barometer (mercury tube) of Evangelista Torricelli or Toricelli during the experiment
![Blaise Pascal (1623-1662) French mathematician, physicist and religious philosopher. 1878. Pascal carrying out experiments with the mercury barometer on the tower of St Jacques-la-Boucherie, Paris. From La Nature. (Paris, 1878). Engraving. - SuperStock Blaise Pascal (1623-1662) French mathematician, physicist and religious philosopher. 1878. Pascal carrying out experiments with the mercury barometer on the tower of St Jacques-la-Boucherie, Paris. From La Nature. (Paris, 1878). Engraving. - SuperStock](https://www.superstock.com/cdn/1746/Comp/1746-2623.webp)
Blaise Pascal (1623-1662) French mathematician, physicist and religious philosopher. 1878. Pascal carrying out experiments with the mercury barometer on the tower of St Jacques-la-Boucherie, Paris. From La Nature. (Paris, 1878). Engraving. - SuperStock
![Experience of Blaise Pascal with a mercury barometer at the top of the Tour Saint Jacques la Boucherie in Paris. Experience of Blaise Pascal with a mercury barometer at the top of the Tour Saint Jacques la Boucherie in Paris.](https://www.meisterdrucke.ie/kunstwerke/500px/Unknown_Artist_-_Experience_of_Blaise_Pascal_with_a_mercury_barometer_at_the_top_of_the_Tour_Sain_-_(MeisterDrucke-987378).jpg)
Experience of Blaise Pascal with a mercury barometer at the top of the Tour Saint Jacques la Boucherie in Paris.
![Mercury Barometer Working | Atmospheric Pressure Measurement | Fluid Mechanics | Shubham Kola - YouTube Mercury Barometer Working | Atmospheric Pressure Measurement | Fluid Mechanics | Shubham Kola - YouTube](https://i.ytimg.com/vi/-7jW_R25lKI/sddefault.jpg)
Mercury Barometer Working | Atmospheric Pressure Measurement | Fluid Mechanics | Shubham Kola - YouTube
![Fischer Barometer Pascal, Brass-Mahogany 6.7" / 170 mm - 1434B-22-US (US Version) : Patio, Lawn & Garden - Amazon.com Fischer Barometer Pascal, Brass-Mahogany 6.7" / 170 mm - 1434B-22-US (US Version) : Patio, Lawn & Garden - Amazon.com](https://m.media-amazon.com/images/I/61RCqHp0UcL._SR600%2C315_PIWhiteStrip%2CBottomLeft%2C0%2C35_PIStarRatingFOUR%2CBottomLeft%2C360%2C-6_SR600%2C315_ZA38%2C445%2C290%2C400%2C400%2CAmazonEmberBold%2C12%2C4%2C0%2C0%2C5_SCLZZZZZZZ_FMpng_BG255%2C255%2C255.jpg)
Fischer Barometer Pascal, Brass-Mahogany 6.7" / 170 mm - 1434B-22-US (US Version) : Patio, Lawn & Garden - Amazon.com
![Pascal measuring the air pressure as part of his expansion of Evangelista Torricelli's work in developing the barometer. Blaise Pascal (June 19, 1623 - August 19, 1662) was a French mathematician, physicist, Pascal measuring the air pressure as part of his expansion of Evangelista Torricelli's work in developing the barometer. Blaise Pascal (June 19, 1623 - August 19, 1662) was a French mathematician, physicist,](https://c8.alamy.com/comp/G15D5F/pascal-measuring-the-air-pressure-as-part-of-his-expansion-of-evangelista-G15D5F.jpg)
Pascal measuring the air pressure as part of his expansion of Evangelista Torricelli's work in developing the barometer. Blaise Pascal (June 19, 1623 - August 19, 1662) was a French mathematician, physicist,
![Amazon.com: Fischer Barometer "Pascal", Brass-Mahogany 5.5"/140 mm - 1366R-22 (Display English) : Patio, Lawn & Garden Amazon.com: Fischer Barometer "Pascal", Brass-Mahogany 5.5"/140 mm - 1366R-22 (Display English) : Patio, Lawn & Garden](https://m.media-amazon.com/images/I/71-TYXOPLHL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Fischer Barometer "Pascal", Brass-Mahogany 5.5"/140 mm - 1366R-22 (Display English) : Patio, Lawn & Garden
![Amazon.com : Fischer Barometer Pascal, Brass-Mahogany 6.7" / 170 mm - 1434B-22-US (US Version) : Patio, Lawn & Garden Amazon.com : Fischer Barometer Pascal, Brass-Mahogany 6.7" / 170 mm - 1434B-22-US (US Version) : Patio, Lawn & Garden](https://m.media-amazon.com/images/I/61RCqHp0UcL._AC_UF894,1000_QL80_.jpg)