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The Barometer. Evangelista Torricelli became the first scientist to create a sustained vacuum and to discover the principle of a barometer. Torricelli realized that the variation of the height of the mercury from day to day was caused by changes in the atmospheric pressure.
The surface charge gives rise to a potential distribution around the particle: the value of this potential at the slipping plane 4 is defined as the zeta potential. 3 Tyndall effect â The scattering of light as it passes through a medium containing small particles.