Torr,

Definition

A torr is a unit of pressure defined as 1/760th of an atmosphere. It is named after Evangelista Torricelli, an Italian physicist known for his work in fluid mechanics.

5 Must Know Facts For Your Next Test

1. 1 Torr equals 133.322 Pascals.
2. The torr is commonly used in vacuum measurements.
3. It is derived from the standard atmospheric pressure, where 1 atm = 760 Torr.
4. The term originates from Evangelista Torricelli, the inventor of the barometer.
5. In scientific contexts, torr and mmHg (millimeters of mercury) are often used interchangeably.

Review Questions

• How many Pascals are there in one Torr?
• What historical figure is the unit 'torr' named after?
• What is the relationship between atmospheres and torrs?

Related terms

Pascal:

The SI unit of pressure, equivalent to one newton per square meter.

Atmosphere: A unit of pressure defined as being precisely equal to $101325 \text{ Pa}$.

Barometer:

An instrument used to measure atmospheric pressure.