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Inches of mercury to hectopascals conversion

Inches of mercury to hectopascals conversion table

Inches of mercury (inHg)	hectopascals (hPa)
0	0
1	33.863889532611
2	67.727779065222
3	101.59166859783
4	135.45555813044
5	169.31944766305
6	203.18333719567
7	237.04722672828
8	270.91111626089
9	304.7750057935
10	338.63889532611
20	677.27779065222
30	1015.9166859783
40	1354.5555813044
50	1693.1944766305
60	2031.8333719567
70	2370.4722672828
80	2709.1111626089
90	3047.750057935
100	3386.3889532611
1000	33863.889532611

How to convert inches of mercury to hectopascals?

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Converting Inches of Mercury to Hectopascals

1 inch of mercury (inHg) is defined as the pressure exerted by a 1-inch column of mercury at the standard acceleration of gravity. The standard value for 1 inHg is approximately 33.8639 hectopascals (hPa).

So, to convert 1 inHg to hPa: $1 \text{ inHg} = 33.8639 \text{ hPa}$

Real-World Examples of Inches of Mercury

Weather and Barometric Pressure:
- The standard atmospheric pressure at sea level is about 29.92 inHg, which is equivalent to approximately 1013.25 hPa. This value is commonly used in meteorology to compare atmospheric pressures in weather forecasts.
Automotive:
- In the automotive industry, vacuum pressure within the intake manifold is often measured in inches of mercury. For example, a typical reading might range between 18 to 22 inHg under idle conditions in a gasoline engine.
Aviation:
- Pilots use inches of mercury to calibrate altimeters. For instance, standard settings for altitude determination in the United States might involve setting the altimeter to reflect an atmospheric pressure of 29.92 inHg, which correlates with sea level pressure.
Medical:
- Blood pressure measurements may sometimes be referenced against a column of mercury, though generally in millimeters of mercury (mmHg). However, knowing how inches of mercury relate can be useful for context. For instance, 1 inHg = 25.4 mmHg, so a blood pressure reading of 120/80 mmHg would be about 4.72/3.15 inHg.

By understanding these conversions and real-world examples, you can appreciate how versatile the unit "inches of mercury" is across various fields.

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 hectopascals to other unit conversions.

What is inches of mercury?

Inches of mercury (inHg) is a unit of measurement used to express atmospheric pressure or the height of a column of mercury that would be exerting a given pressure.

In other words, it's a measure of how much pressure is being exerted on the atmosphere by gravity. The unit was originally defined as the pressure exerted by a column of mercury 1 inch (2.54 cm) high at sea level and at standard temperature (32°F/0°C).

To put it simply:

1 inch of mercury is equivalent to about 25.4 millimeters of mercury
It's also equivalent to approximately 3386 pascals or 49.9 pounds per square inch

Inches of mercury are commonly used in weather forecasting, particularly for measuring the pressure of low-pressure systems such as hurricanes and typhoons. Weather forecasters often report barometric pressure using inches of mercury, especially when discussing tropical cyclones.

So, to summarize: inches of mercury is a unit of measurement that expresses atmospheric pressure or the height of a column of mercury exerting a given pressure!

What is a Hectopascal?

The hectopascal (hPa) is a 100 pascals (Pa). This is also known as millibar. The pascal is a SI unit that measures pressure. Pascal unit is named after Blaise Pascal and it replaced the previously used units for pressure $N/m^2$ in SI unit system. Following are equal representation of 1 Hectopascal in other units.

1\ hPa = 1\ millibar = \frac{100 *N}{m^2} = \frac{100 *kg}{m*s^2} = \frac{100 *J}{m^3}

Where
$N - Newtons$
$kg - Kilograms$
$m - Meters$
$s - Seconds$
$J - Jules$

Wikipedia page link for Pascal

Complete Inches of mercury conversion table

Enter # of Inches of mercury

Convert 1 inHg to other units	Result
Inches of mercury to pascals (inHg to Pa)	3386.3889532611
Inches of mercury to kilopascals (inHg to kPa)	3.3863889532611
Inches of mercury to megapascals (inHg to MPa)	0.003386388953261
Inches of mercury to hectopascals (inHg to hPa)	33.863889532611
Inches of mercury to bar (inHg to bar)	0.03386388953261
Inches of mercury to torr (inHg to torr)	25.400005965738
Inches of mercury to meters of water @ 4°C (inHg to mH2O)	0.345315571909
Inches of mercury to millimeters of mercury (inHg to mmHg)	25.400076155931
Inches of mercury to pounds per square inch (inHg to psi)	0.491154
Inches of mercury to kilopound per square inch (inHg to ksi)	0.000491154

Inches of mercury to hectopascals conversion