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Inches of mercury to millimeters of mercury conversion

Inches of mercury to millimeters of mercury conversion table

Inches of mercury (inHg)millimeters of mercury (mmHg)
00
125.400076155931
250.800152311863
376.200228467794
4101.60030462373
5127.00038077966
6152.40045693559
7177.80053309152
8203.20060924745
9228.60068540338
10254.00076155931
20508.00152311863
30762.00228467794
401016.0030462373
501270.0038077966
601524.0045693559
701778.0053309152
802032.0060924745
902286.0068540338
1002540.0076155931
100025400.076155931

How to convert inches of mercury to millimeters of mercury?

Inches of mercury (inHg) and millimeters of mercury (mmHg) are both units used to measure pressure, particularly in barometric measurements and in various scientific contexts. To convert inches of mercury to millimeters of mercury, you can use the following conversion factor:

1 inch of mercury (inHg) = 25.4 millimeters of mercury (mmHg)

So, to convert 1 inch of mercury to millimeters of mercury:

1 inHg×25.4 mmHg/inHg=25.4 mmHg1 \text{ inHg} \times 25.4 \text{ mmHg/inHg} = 25.4 \text{ mmHg}

Therefore, 1 inch of mercury is equal to 25.4 millimeters of mercury.

Real-World Examples of Inches of Mercury

  1. Barometric Pressure Measurement:

    • Barometric pressure in meteorology is often measured in inches of mercury. For example, standard atmospheric pressure at sea level is typically about 29.92 inHg, which is equivalent to approximately 760 mmHg.

  2. Vacuum Systems:

    • In industrial and laboratory settings, vacuum systems may be described using inches of mercury. For example, a high vacuum system might achieve pressures as low as 0.5 inHg, which translates to about 12.7 mmHg.

  3. Automotive Applications:

    • In automotive diagnostics, manifold vacuum (intake manifold pressure) is often measured in inches of mercury. A typical reading for a healthy engine at idle might be around 20 inHg, which is equivalent to 508 mmHg.

  4. Medical Instruments:

    • Blood pressure monitors sometimes use mercury columns for highly accurate readings, and while mmHg is the standard, older devices or data might also use inHg. For example, a blood pressure reading of 120 mmHg systolic can be converted as follows: 120 mmHg25.4 mmHg/inHg≈4.72 inHg\frac{120 \text{ mmHg}}{25.4 \text{ mmHg/inHg}} \approx 4.72 \text{ inHg}

Understanding these conversions and their applications helps make sense of how pressure measurements are used across different 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 millimeters of mercury 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 millimeters of mercury?

Millimeters of mercury (mmHg) is a unit of measurement used to express pressure, specifically atmospheric pressure. It's commonly used in medicine and physiology to measure blood pressure.

In essence, mmHg measures the pressure exerted by a column of mercury, which is a dense liquid metal, against a surface. The "millimeter" refers to the height of the mercury column, while the "mercury" part comes from the use of mercury as the liquid in the measuring device.

A standard barometer (an instrument that measures atmospheric pressure) uses a column of mercury to measure pressure. When the air pressure is high, the mercury level rises, and when it's low, the level drops. This allows for a direct measurement of the pressure in terms of millimeters of mercury.

In medical contexts, blood pressure readings are expressed in mmHg (systolic pressure) over mmHg (diastolic pressure). For example:

  • A blood pressure reading of 120/80 mmHg means that the systolic pressure is 120 mmHg and the diastolic pressure is 80 mmHg.

The use of mmHg as a unit of measurement has been largely replaced by other units, such as kilopascals (kPa), in scientific and technical applications. However, it remains a widely recognized and used unit in medical and physiological contexts.

Complete Inches of mercury conversion table

Enter # of Inches of mercury
Convert 1 inHg to other unitsResult
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

Pressure conversions