'Torr' is a unit of _______.

pressure

The correct answer is option 1. pressure.

'Torr' is a unit of pressure. Torr is a unit of pressure named after the Italian physicist Evangelista Torricelli, who invented the barometer. It is commonly used in the measurement of pressures, especially in the fields of physics, chemistry, and engineering. One torr is defined as 1/760th of standard atmospheric pressure at sea level, which is equivalent to approximately 133.322 Pa (pascals) or 1 mmHg (millimeters of mercury).