Convert Mbar to Bar
1 mbar equals 0.001 bar.
Mbar to Bar Converter
How to Convert Mbar to Bar
1 mbar = 0.001 bar
Bar = Mbar × 0.001
Example: 1 mbar × 0.001 = 0.001 bar
Reverse Conversion
To convert bar back to mbar:
- Remember, 1 bar equals 1000 mbar.
- To convert 0.001 bar to mbar, multiply
0.001 x 1000, resulting in1 mbar.
Mbar to bar Conversion Table
Reference table with common mbar to bar conversions. All values calculated with high precision.
Mbar to Bar Table
1000 to 1 × 108
Bar to Mbar Table
1 to 100000
Definition of Mbar
Millibar: The Meteorologist's Unit
The millibar (mbar) is a metric unit of pressure equal to one-thousandth of a bar, or 100 pascals. It is the traditional unit used in meteorology for measuring atmospheric pressure and is still widely used in weather forecasting, aviation, and climate science. Standard atmospheric pressure at sea level is approximately 1013.25 mbar.
Conversions to Other Units of Measurement:
- Hectopascal (hPa): 1 millibar equals exactly 1 hectopascal. These units are numerically identical and are used interchangeably in meteorology.
- Pascal (Pa): 1 millibar equals exactly 100 pascals. This is the fundamental SI relationship.
- Bar: 1 millibar equals exactly 0.001 bar. This follows from the definition of the millibar as one-thousandth of a bar.
- Atmosphere (atm): 1 millibar equals approximately 0.000986923 atm. Standard atmospheric pressure (1013.25 mbar) equals approximately 1 atm.
- Inches of Mercury (inHg): 1 millibar equals approximately 0.02953 inHg. This conversion is used in North American weather reports.
The millibar remains the preferred unit for meteorologists worldwide due to its convenient scale for expressing atmospheric pressure variations.
- Definition
- Metric pressure unit equal to one-thousandth of a bar (0.001 bar) or 100 pascals.
- Exact factor
- 1 mbar = 100 Pa (exact); 1 mbar = 1 hPa (exact)
- Common equivalents
- 1 mbar = 0.001 bar (exact)
- 1013.25 mbar = 1 atm (exact)
- 1 mbar ≈ 0.02953 inHg
- Sources
Definition of Bar
Bar: A Widely Used Pressure Unit
The bar is a metric unit of pressure defined as exactly 100,000 pascals (100 kPa). While not an SI unit, it is accepted for use with the SI and is widely used in meteorology, engineering, and industry. The bar is particularly convenient because standard atmospheric pressure (1 atm) is approximately equal to 1 bar (actually 1.01325 bar).
Conversions to Other Units of Measurement:
- Pascal (Pa): 1 bar equals exactly 100,000 pascals. This conversion is used when working with SI units. For example, 2 bar equals 200,000 Pa or 200 kPa.
- PSI (Pound per Square Inch): 1 bar equals approximately 14.5038 psi. This is one of the most common conversions in industrial applications. For example, a tire pressure of 2.5 bar equals approximately 36.3 psi.
- Atmosphere (atm): 1 bar equals approximately 0.986923 atm. Standard atmospheric pressure (1 atm) equals 1.01325 bar.
- Kilopascal (kPa): 1 bar equals exactly 100 kPa. This conversion is straightforward and commonly used in engineering. For example, 3.5 bar equals 350 kPa.
- Millibar (mbar): 1 bar equals exactly 1,000 millibar. Millibars are commonly used in meteorology for atmospheric pressure measurements.
The bar is valued for its practical convenience, being close to atmospheric pressure while having a simple relationship with SI units.
- Definition
- Metric pressure unit equal to exactly 100,000 pascals.
- Exact factor
- 1 bar = 100,000 Pa (exact); 1 bar = 10⁵ Pa
- Common equivalents
- 1 bar = 1,000 mbar (exact)
- 1 bar ≈ 14.50377 psi
- 1 bar ≈ 0.986923 atm
- Sources
About the Bar
Facts & Uses
- 1 bar = 100,000 Pa = 100 kPa exactly. Defined in 1909 by Vilhelm Bjerknes as a convenient meteorological unit close to atmospheric pressure.
- Standard for tire pressure in many European countries (~2.0-2.5 bar for cars), compressed air systems, and water pressure.
- Common in diving (1 bar per 10 m of seawater depth), brewing (espresso extraction at 9 bar), and scuba tanks (200-300 bar fill pressure).
- Weather use: millibars (mbar) = 1/1000 bar = hectopascals (hPa). 1013 mbar = standard sea level pressure.
Curiosities
- The bar is not part of the SI, but is accepted for use with the SI system because of its convenient scale and historical adoption in meteorology.
- The name comes from the Greek "baros" (βάρος) meaning "weight" — also the root of "barometer" and "barometric pressure".
- Atmospheric pressure varies from a record low of 870 mbar (Typhoon Tip, 1979) to a record high of 1085 mbar (Mongolia, 2001).
- Approximate equivalents: 1 bar = 14.504 psi = 0.987 atm = 750 mmHg.
Sources
Frequently Asked Questions
How many bar are in one mbar?
One mbar equals 0.001 bar. To convert, multiply the mbar value by 0.001. For the reverse, divide the bar value by 0.001 (or multiply by 1000).
What is <span class="fraction"><span class="top">1</span><span class="bottom">5</span></span> mbar in bar?
15 mbar = 0.0002 bar. This is one of the most commonly searched conversions for this pair.
Is the mbar-to-bar conversion exact?
Yes. The factor 0.001 is exact by international definition, not an approximation. Any imprecision comes only from the original measurement, not the conversion.
Looking for the reverse? Convert Bar to Mbar
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