Torr and Pascal are both units of pressure. Torr (or mmHg) is commonly used in chemistry and vacuum science, while Pascal (Pa) is the standard SI unit. One Torr is equal to approximately133.322 Pa. The conversion formula is simple:

Pressure in Pa = Pressure in Torr × 133.322

Step-by-Step Process

1. Write down the pressure value in Torr.
2. Multiply it by 133.322 (you can use a calculator for accuracy).
3. Round the result to the desired number of decimal places, depending on your needs.
4. Add the unit "Pa" to your answer.

Example 1:Convert 5 Torr to Pa.
5 × 133.322 = 666.61 Pa
So, 5 Torr is about 667 Pa.

Example 2:Convert 760 Torr (standard atmospheric pressure) to Pa.
760 × 133.322 = 101,324.72 Pa
This rounds to 101,325 Pa, matching the exact value for 1 atm.

Quick Tip:For a rough estimate, remember that 1 Torr ≈ 133 Pa. This works well for quick mental math but use the full 133.322 for precise calculations!

Practice with these steps, and converting Torr to Pascal will become second nature. Always double-check your multiplication to avoid errors.

Torr

DefinitionThe torr is a unit used to measure pressure, especially in situations involving low pressures like vacuums. One torr is equal to the pressure needed to support a column of mercury that is exactly one millimeter high at sea level and zero degrees Celsius. It is very close to another unit called the millimeter of mercury (mmHg), where 1 torr equals about 1 mmHg.

History/OriginThe torr gets its name from Evangelista Torricelli, an Italian scientist who lived in the 1600s. In 1643, Torricelli invented the first mercury barometer, a device that measures air pressure by the height of a mercury column in a glass tube. This invention showed that air has weight and pressure, and the torr honors his work by defining pressure based on a tiny height of mercury.

Current UseToday, the torr is commonly used in fields like vacuum technology, where scientists and engineers study very low pressures, such as in space simulations or semiconductor manufacturing. It is also used in medicine for measuring blood pressure, often listed as mmHg, which is nearly the same. While the international standard unit is the pascal, the torr remains popular because it is easy to relate to mercury barometers.

Pascal

DefinitionThe pascal, abbreviated as Pa, is the standard international unit for measuring pressure in the metric system, known as the SI system. One pascal equals one newton of force spread over one square meter of area, or 1 Pa = 1 N/m². It is a small unit, so pressures are often expressed in kilopascals (kPa), where 1 kPa equals 1,000 Pa.

History/OriginThe pascal is named after Blaise Pascal, a French mathematician, physicist, and inventor from the 1600s. Pascal studied how fluids behave under pressure and discovered Pascal's law, which states that pressure applied to a confined fluid spreads equally in all directions. The unit was officially named in his honor in 1971 by the General Conference on Weights and Measures to standardize pressure measurements worldwide.

Current UseThe pascal is used everywhere in modern science, engineering, and everyday technology, from weather forecasts (atmospheric pressure) to car tires and scuba diving. It appears in physics labs, aviation, and construction. For example, normal air pressure at sea level is about 101,325 Pa. Its adoption promotes consistency in global research and industry.