Evangelista Torricelli was well known for which discovery?

Invention of mercury barometer

The correct answer is option 3. Invention of mercury barometer.

Evangelista Torricelli was well known for the discovery and invention of the mercury barometer.

Torricelli is credited with inventing the mercury barometer, a device used to measure atmospheric pressure. This invention was significant as it provided a practical means of measuring air pressure and led to advancements in meteorology and the understanding of atmospheric phenomena.