bar (bar) to torr (torr) conversion

bar to torr conversion table

bar (bar)torr (torr)
00
1750.06168270417
21500.1233654083
32250.1850481125
43000.2467308167
53750.3084135208
64500.370096225
75250.4317789292
86000.4934616334
96750.5551443375
107500.6168270417
2015001.233654083
3022501.850481125
4030002.467308167
5037503.084135208
6045003.70096225
7052504.317789292
8060004.934616334
9067505.551443375
10075006.168270417
1000750061.68270417

How to convert bar to torr?

Converting between bar and torr involves a simple, direct relationship, making it a fundamental conversion in fields like vacuum technology, meteorology, and engineering.

Understanding the Conversion

Both bar and torr are units of pressure. A bar is defined as 100,000 Pascals (Pa), which is a metric unit of pressure. Torr, on the other hand, is named after Evangelista Torricelli, an Italian physicist who invented the barometer in the 17th century. 1 torr is approximately equal to the pressure exerted by a 1-millimeter column of mercury (mm Hg).

The conversion factor between bar and torr is:

1 bar=750.061683 torr1 \text{ bar} = 750.061683 \text{ torr}

Converting Bar to Torr

To convert from bar to torr, multiply the pressure in bar by the conversion factor 750.061683750.061683.

Example: Convert 1 bar to torr.

1 bar×750.061683torrbar=750.061683 torr1 \text{ bar} \times 750.061683 \frac{\text{torr}}{\text{bar}} = 750.061683 \text{ torr}

Converting Torr to Bar

To convert from torr to bar, divide the pressure in torr by the conversion factor 750.061683750.061683.

Example: Convert 1 torr to bar.

1 torr÷750.061683torrbar=0.00133322 bar1 \text{ torr} \div 750.061683 \frac{\text{torr}}{\text{bar}} = 0.00133322 \text{ bar}

Interesting Facts

  • Evangelista Torricelli (1608-1647): Torricelli was an Italian physicist and mathematician, best known for his invention of the barometer. His work on atmospheric pressure laid the foundation for understanding vacuum and fluid dynamics. He demonstrated that air has weight and produces pressure, a concept that was revolutionary at the time.
  • Standard Atmospheric Pressure: 1 standard atmosphere (atm) is defined as 101,325 Pascals, which is equivalent to 1.01325 bar or 760 torr. This is the average atmospheric pressure at sea level.

Real-World Examples

  1. Meteorology: Weather forecasts often use millibars (mbar) to measure atmospheric pressure. To relate these readings to vacuum experiments or other scientific contexts, one might need to convert mbar to torr. For example, a typical atmospheric pressure of 1013 mbar is equivalent to:

    1013 mbar=1.013 bar=1.013×750.061683 torr≈759.81 torr1013 \text{ mbar} = 1.013 \text{ bar} = 1.013 \times 750.061683 \text{ torr} \approx 759.81 \text{ torr}

  2. Vacuum Technology: In vacuum systems, pressure is often measured in torr. Scientists and engineers use this unit to monitor the performance of vacuum pumps and to ensure the desired level of vacuum is achieved for experiments or manufacturing processes. Converting bar to torr helps in calibrating instruments and comparing readings.

    • Example: A vacuum chamber might need to achieve a pressure of 10−610^{-6} torr for a specific experiment. Converting this to bar:

      10−6 torr=10−6÷750.061683 bar≈1.33×10−9 bar10^{-6} \text{ torr} = 10^{-6} \div 750.061683 \text{ bar} \approx 1.33 \times 10^{-9} \text{ bar}

  3. Diving: Divers need to be aware of the pressure exerted on their bodies as they descend into the water. Pressure increases by approximately 1 bar for every 10 meters of depth. Knowing the equivalent pressure in torr can be useful for understanding the limits of diving equipment and physiological effects.

    • Example: At a depth of 30 meters, the pressure is approximately 4 bar (1 bar atmospheric pressure + 3 bar from the water column). Converting this to torr:

      4 bar=4×750.061683 torr≈3000.25 torr4 \text{ bar} = 4 \times 750.061683 \text{ torr} \approx 3000.25 \text{ torr}

See below section for step by step unit conversion with formulas and explanations. Please refer to the table below for a list of all the torr to other unit conversions.

What is bar?

The bar is a metric unit of pressure, widely used in science, engineering, and industry. It's a convenient unit because it is close to standard atmospheric pressure on Earth. Below is detailed information about bar, it's origin, and some real-world examples.

Definition of Bar

The bar is defined as exactly 100,000100,000 Pascals (105Pa10^5 Pa). The Pascal (Pa) is the SI unit of pressure, defined as one Newton per square meter (N/m2N/m^2). Therefore:

1 bar=100,000 Pa=105 N/m21 \, bar = 100,000 \, Pa = 10^5 \, N/m^2

Origin and History

The bar was introduced by British physicist Sir Napier Shaw in 1909. The goal was to have a unit of pressure that was close to atmospheric pressure but based on the metric system. The term "bar" comes from the Greek word "βάρος" (baros) meaning "weight."

Relation to Atmospheric Pressure

Standard atmospheric pressure at sea level is approximately 1.013251.01325 bar. Because of this proximity, the bar and millibar (1 mbar = 0.001 bar) are frequently used in meteorology to measure atmospheric pressure. Historically, meteorologists used millibars, but now the SI unit, the hectopascal (hPa), is also widely used (1 hPa = 1 mbar).

Real-World Examples and Applications

  • Tire Pressure: Car and bicycle tire pressures are often measured in bar or PSI (pounds per square inch). For example, a car tire might be inflated to 2.5 bar.
  • Weather Reports: Atmospheric pressure in weather reports can be given in millibars or hectopascals, where 1013.25 mbar is standard atmospheric pressure.
  • Scuba Diving: Divers often use bar to measure the pressure of compressed air in their tanks. A typical scuba tank might be filled to 200 bar.
  • Industrial Processes: Many industrial processes, such as hydraulic systems and pressure testing, use bar as a convenient unit of measurement.
  • Geology: Pressures deep within the Earth are often measured in kilobars (kbar), where 1 kbar = 1000 bar.
  • Vacuum: While bar is not commonly used for measuring high vacuum, it's relevant when discussing rough or backing vacuum levels. For high vacuum, units like Torr or Pascal are more typical.

Interesting Facts

  • The bar is a metric unit but not an SI unit. The SI unit for pressure is the Pascal (Pa).
  • The millibar (mbar) is commonly used in meteorology.
  • 1 bar is approximately equal to 0.987 atmospheres (atm).

What is torr?

Torr is a unit of pressure measurement commonly used in vacuum applications. Let's delve into its definition, origin, and relevance.

Definition of Torr

The torr is a unit of pressure defined as 1/760 of standard atmospheric pressure. In other words, 760 torr is approximately equal to one atmosphere (atm).

1 torr≈1760 atm1 \text{ torr} \approx \frac{1}{760} \text{ atm}

It is also nearly equal to one millimeter of mercury (mmHg). More precisely:

1 torr≈1 mmHg1 \text{ torr} \approx 1 \text{ mmHg}

Origin and History

The torr is named after Italian physicist and mathematician Evangelista Torricelli (1608–1647), who invented the barometer in 1643. Torricelli's experiment demonstrated that air pressure could support a column of mercury, paving the way for pressure measurement.

Relation to Pascal (Pa)

The pascal (Pa) is the SI unit of pressure. The relationship between torr and pascal is as follows:

1 torr≈133.322 Pa1 \text{ torr} \approx 133.322 \text{ Pa}

Therefore, to convert from torr to pascals, you can use the formula:

Pressure in Pa=Pressure in torr×133.322\text{Pressure in Pa} = \text{Pressure in torr} \times 133.322

Real-World Examples and Applications

Torr is commonly used in fields that involve vacuum systems, such as:

  • Vacuum pumps: Vacuum pump performance is often rated in torr or millitorr (mTorr). For example, a roughing pump might achieve a vacuum of 10$^{-3}$ torr.
  • Scientific instruments: Mass spectrometers, electron microscopes, and other analytical instruments require high vacuum conditions, often specified in torr or microtorr (µTorr).
  • Semiconductor manufacturing: Vacuum processes, such as chemical vapor deposition (CVD) and sputtering, use vacuum levels measured in torr to control deposition rates and film quality.
  • Space research: Simulating space environments requires extremely low pressures, which are measured in torr or even smaller units like picotorr (pTorr).
  • Vacuum Furnaces: Sintering, brazing, and heat treating of materials at reduced pressures, which improves the properties of the final product.

Interesting Facts

  • While torr and mmHg are often used interchangeably, they are technically slightly different due to variations in the definition of standard gravity.
  • The unit "micron" (µ) is sometimes used as a unit of pressure, where 1 micron = 1 mTorr.
  • The lowest pressure ever achieved in a laboratory setting is on the order of 10−1710^{-17} torr.

Complete bar conversion table

Enter # of bar
Convert 1 bar to other unitsResult
bar to pascals (bar to Pa)100000
bar to kilopascals (bar to kPa)100
bar to megapascals (bar to MPa)0.1
bar to hectopascals (bar to hPa)1000
bar to millibar (bar to mbar)1000
bar to torr (bar to torr)750.06168270417
bar to meters of water @ 4°C (bar to mH2O)10.197162129779
bar to millimeters of mercury (bar to mmHg)750.06375541921
bar to pounds per square inch (bar to psi)14.503768078
bar to kilopound per square inch (bar to ksi)0.014503768078
bar to Inches of mercury (bar to inHg)29.529980572285

Pressure conversions