millibar (mbar) to Inches of mercury (inHg) conversion

millibar to Inches of mercury conversion table

millibar (mbar)Inches of mercury (inHg)
00
10.02952998057228
20.05905996114457
30.08858994171685
40.1181199222891
50.1476499028614
60.1771798834337
70.206709864006
80.2362398445783
90.2657698251506
100.2952998057228
200.5905996114457
300.8858994171685
401.1811992228914
501.4764990286142
601.7717988343371
702.0670986400599
802.3623984457828
902.6576982515056
1002.9529980572285
100029.529980572285

How to convert millibar to inches of mercury?

Converting between millibars (mbar) and inches of mercury (inHg) involves understanding the relationship between these two units of pressure. Here's a guide to help you perform these conversions accurately.

Understanding the Conversion

Millibars and inches of mercury are both units used to measure pressure, commonly in meteorology and aviation. Converting between them requires a specific conversion factor. The conversion is the same between base 10 and base 2.

Converting Millibars to Inches of Mercury

To convert millibars to inches of mercury, you can use the following conversion factor:

1 mbar=0.02953 inHg1 \text{ mbar} = 0.02953 \text{ inHg}

Therefore, to convert 1 millibar to inches of mercury:

1 mbar×0.02953inHgmbar=0.02953 inHg1 \text{ mbar} \times 0.02953 \frac{\text{inHg}}{\text{mbar}} = 0.02953 \text{ inHg}

So, 1 millibar is equal to approximately 0.02953 inches of mercury.

Converting Inches of Mercury to Millibars

To convert inches of mercury to millibars, you use the reciprocal of the above conversion factor:

1 inHg=33.8639 mbar1 \text{ inHg} = 33.8639 \text{ mbar}

Therefore, to convert 1 inch of mercury to millibars:

1 inHg×33.8639mbarinHg=33.8639 mbar1 \text{ inHg} \times 33.8639 \frac{\text{mbar}}{\text{inHg}} = 33.8639 \text{ mbar}

So, 1 inch of mercury is equal to approximately 33.8639 millibars.

Interesting Facts and People

Evangelista Torricelli: The unit "inches of mercury" has historical significance, linked to Evangelista Torricelli's experiments in the 17th century. Torricelli, an Italian physicist and mathematician, invented the mercury barometer in 1643. His experiment demonstrated that atmospheric pressure could support a column of mercury to a certain height, which led to the use of mercury levels as a pressure measurement.

Real-World Examples

Here are a few examples of converting common pressure values:

  1. Standard Atmospheric Pressure:

    • Standard atmospheric pressure is defined as 1013.25 mbar. Converting this to inches of mercury:

      1013.25 mbar×0.02953inHgmbar29.92 inHg1013.25 \text{ mbar} \times 0.02953 \frac{\text{inHg}}{\text{mbar}} \approx 29.92 \text{ inHg}

    • This is why standard atmospheric pressure is often quoted as approximately 29.92 inches of mercury.
  2. Aviation Altimeters:

    • Pilots often adjust their altimeters using inches of mercury. Suppose an altimeter is set to 30.10 inHg. Converting this to millibars:

      30.10 inHg×33.8639mbarinHg1019.29 mbar30.10 \text{ inHg} \times 33.8639 \frac{\text{mbar}}{\text{inHg}} \approx 1019.29 \text{ mbar}

  3. Meteorological Reports:

    • Weather reports might indicate a low-pressure system with a central pressure of 980 mbar. Converting this to inches of mercury:

      980 mbar×0.02953inHgmbar28.94 inHg980 \text{ mbar} \times 0.02953 \frac{\text{inHg}}{\text{mbar}} \approx 28.94 \text{ inHg}

  4. High-Pressure System:

    • A high-pressure system might register 1030 mbar. Converting this to inches of mercury:

      1030 mbar×0.02953inHgmbar30.42 inHg1030 \text{ mbar} \times 0.02953 \frac{\text{inHg}}{\text{mbar}} \approx 30.42 \text{ inHg}

These examples highlight how these conversions are used in practical scenarios, especially in fields like aviation and meteorology, where accurate pressure readings are crucial.

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 Inches of mercury to other unit conversions.

What is millibar?

The millibar (mbar) is a unit of pressure commonly used in meteorology to measure atmospheric pressure. Understanding millibars helps in interpreting weather patterns and forecasts. Below is an overview of millibars, their relation to other units, and their significance.

Definition of Millibar

A millibar is defined as 100 Pascals (Pa), where a Pascal is the SI unit of pressure (force per unit area). The prefix "milli-" indicates one-thousandth, so:

1 mbar=100 Pa=1 hPa1 \text{ mbar} = 100 \text{ Pa} = 1 \text{ hPa}

Another unit of pressure is standard atmosphere (atm)

1 atm=1013.25 mbar1 \text{ atm} = 1013.25 \text{ mbar}

Formation and History

The term "bar" comes from the Greek word "báros," meaning weight. The bar was introduced by the British physicist Napier Shaw in 1909, and the millibar soon followed as a more practical unit for meteorology because typical atmospheric pressures on Earth are close to 1000 mbar.

Relation to Other Units

  • Pascal (Pa): The SI unit of pressure. 1 mbar=100 Pa1 \text{ mbar} = 100 \text{ Pa}.
  • Hectopascal (hPa): 1 hPa=1 mbar1 \text{ hPa} = 1 \text{ mbar}. Hectopascals are numerically equivalent to millibars and are commonly used in aviation.
  • Atmosphere (atm): Standard atmospheric pressure at sea level is approximately 1013.25 mbar1013.25 \text{ mbar}.
  • Inches of Mercury (inHg): Commonly used in aviation in the United States. 1 mbar0.02953 inHg1 \text{ mbar} \approx 0.02953 \text{ inHg}.

Significance in Meteorology

Atmospheric pressure is a critical factor in weather forecasting. Here's how millibars are used:

  • Weather Maps: Isobars (lines of equal pressure) on weather maps are often labeled in millibars, showing high and low-pressure systems.
  • High-Pressure Systems: Associated with stable weather conditions, typically ranging from 1015 mbar to 1035 mbar or higher.
  • Low-Pressure Systems: Associated with unsettled weather, such as storms and rain, typically ranging from 980 mbar to 1000 mbar or lower.
  • Storm Intensity: The central pressure of a hurricane or cyclone is measured in millibars; lower pressures indicate stronger storms. For example, Hurricane Wilma in 2005 had a record low central pressure of 882 mbar.
  • Aviation: Altitude is determined by measuring atmospheric pressure

Real-World Examples

  • Standard Sea Level Pressure: The standard atmospheric pressure at sea level is approximately 1013.25 mbar1013.25 \text{ mbar}.
  • Hurricane Central Pressure: Intense hurricanes can have central pressures below 950 mbar950 \text{ mbar}. For example, Hurricane Katrina (2005) had a minimum central pressure of around 902 mbar902 \text{ mbar}.
  • Mount Everest Summit Pressure: The atmospheric pressure at the summit of Mount Everest is roughly 330 mbar330 \text{ mbar}.
  • Typical House Pressure: The pressure inside buildings is near 1013.25 mbar1013.25 \text{ mbar}.

Interesting Facts and Associations

  • Torricelli's Experiment: Evangelista Torricelli, an Italian physicist, invented the barometer in the 17th century, paving the way for accurate pressure measurement. Though he didn't use millibars (as the unit wasn't invented yet), his work laid the foundation for understanding atmospheric pressure. Learn more at Britannica.
  • Beaufort Scale: While the Beaufort scale primarily measures wind speed, it indirectly relates to pressure gradients. Steeper pressure gradients (indicated by closely spaced isobars) typically result in stronger winds. More information is on the National Weather Service.

What is Inches of mercury?

The "inches of mercury" (inHg) is a unit of pressure commonly used in the United States. It's based on the height of a column of mercury that the given pressure will support. This unit is frequently used in aviation, meteorology, and vacuum applications.

Definition and Formation

Inches of mercury is a manometric unit of pressure. It represents the pressure exerted by a one-inch column of mercury at a standard temperature (usually 0°C or 32°F) under standard gravity.

The basic principle is that atmospheric pressure can support a certain height of a mercury column in a barometer. Higher atmospheric pressure corresponds to a higher mercury column, and vice versa. Therefore, the height of this column, measured in inches, serves as a direct indication of the pressure.

Formula and Conversion

Here's how inches of mercury relates to other pressure units:

  • 1 inHg = 3386.39 Pascals (Pa)
  • 1 inHg = 33.8639 millibars (mbar)
  • 1 inHg = 25.4 millimeters of mercury (mmHg)
  • 1 inHg ≈ 0.0334211 atmosphere (atm)
  • 1 inHg ≈ 0.491154 pounds per square inch (psi)

Historical Context: Evangelista Torricelli

The concept of measuring pressure using a column of liquid is closely linked to Evangelista Torricelli, an Italian physicist and mathematician. In 1643, Torricelli invented the mercury barometer, demonstrating that atmospheric pressure could support a column of mercury. His experiments led to the understanding of vacuum and the quantification of atmospheric pressure. Britannica - Evangelista Torricelli has a good intro about him.

Real-World Applications and Examples

  • Aviation: Aircraft altimeters use inches of mercury to indicate altitude. Pilots set their altimeters to a local pressure reading (inHg) to ensure accurate altitude readings. Standard sea level pressure is 29.92 inHg.

  • Meteorology: Weather reports often include atmospheric pressure readings in inches of mercury. These readings are used to track weather patterns and predict changes in weather conditions. For example, a rising barometer (increasing inHg) often indicates improving weather, while a falling barometer suggests worsening weather.

  • Vacuum Systems: In various industrial and scientific applications, inches of mercury is used to measure vacuum levels. For example, vacuum pumps might be rated by the amount of vacuum they can create, expressed in inches of mercury. Higher vacuum levels (i.e., more negative readings) are crucial in processes like freeze-drying and semiconductor manufacturing. For example, common home vacuum cleaners operate in a range of 50 to 80 inHg.

  • Medical Equipment: Some medical devices, such as sphygmomanometers (blood pressure monitors), historically used mmHg (millimeters of mercury), a related unit. While digital devices are common now, the underlying principle remains tied to pressure measurement.

Interesting Facts

  • Standard Atmospheric Pressure: Standard atmospheric pressure at sea level is approximately 29.92 inches of mercury (inHg). This value is often used as a reference point for various measurements and calculations.

  • Altitude Dependence: Atmospheric pressure decreases with altitude. As you ascend, the weight of the air above you decreases, resulting in lower pressure readings in inches of mercury.

  • Temperature Effects: While "inches of mercury" typically refers to a standardized temperature, variations in temperature can slightly affect the density of mercury and, consequently, the pressure reading.

Complete millibar conversion table

Enter # of millibar
Convert 1 mbar to other unitsResult
millibar to pascals (mbar to Pa)100
millibar to kilopascals (mbar to kPa)0.1
millibar to megapascals (mbar to MPa)0.0001
millibar to hectopascals (mbar to hPa)1
millibar to bar (mbar to bar)0.001
millibar to torr (mbar to torr)0.7500616827042
millibar to meters of water @ 4°C (mbar to mH2O)0.01019716212978
millibar to millimeters of mercury (mbar to mmHg)0.7500637554192
millibar to pounds per square inch (mbar to psi)0.014503768078
millibar to kilopound per square inch (mbar to ksi)0.000014503768078
millibar to Inches of mercury (mbar to inHg)0.02952998057228