1 bar is equal to approximately 29.53 inches of mercury (inhg).
The bar and inches of mercury are both units of pressure measurement. One bar is defined as exactly 100,000 pascals, while inches of mercury is a pressure unit based on the height of a mercury column. Converting between them requires multiplying by a factor that accounts for mercury density and gravity.
Conversion Tool
Result in inhg:
Conversion Formula
The formula to convert bar to inhg is:
inhg = bar × 29.529983071445
This works because 1 bar is exactly 100,000 pascals, and 1 inch of mercury corresponds to about 3386.389 pascals. By dividing 100,000 pascals by 3386.389 pascals/inch, you get approximately 29.53 inches of mercury per bar.
Example calculation:
- Start with 1 bar
- Multiply by 29.529983071445
- 1 × 29.529983071445 = 29.529983071445 inhg
- Rounded to four decimal places: 29.5300 inhg
Conversion Example
- 2.5 bar to inhg
- Multiply 2.5 by 29.529983071445
- 2.5 × 29.529983071445 = 73.8249576786 inhg
- Rounded: 73.8250 inhg
- 0.75 bar to inhg
- Multiply 0.75 by 29.529983071445
- 0.75 × 29.529983071445 = 22.1474873036 inhg
- Rounded: 22.1475 inhg
- 10 bar to inhg
- Multiply 10 by 29.529983071445
- 10 × 29.529983071445 = 295.2998307145 inhg
- Rounded: 295.2998 inhg
- 5.2 bar to inhg
- Multiply 5.2 by 29.529983071445
- 5.2 × 29.529983071445 = 153.5559111701 inhg
- Rounded: 153.5559 inhg
Conversion Chart
| Bar | Inches of Mercury (inhg) |
|---|---|
| -24.0 | -708.7196 |
| -18.0 | -531.5397 |
| -12.0 | -354.3598 |
| -6.0 | -177.1799 |
| 0.0 | 0.0000 |
| 6.0 | 177.1799 |
| 12.0 | 354.3598 |
| 18.0 | 531.5397 |
| 24.0 | 708.7196 |
| 26.0 | 768.7795 |
The chart list values in bar on the left, and the equivalent values in inches of mercury on the right. You can find the approximate inhg by looking up the bar value and reading across. Negative values show pressures below atmospheric pressure.
Related Conversion Questions
- What is the exact pressure in inches of mercury when 1 bar is applied?
- How many inhg equals 1 bar at sea level?
- Can I convert 1 bar directly to inhg without using pascals?
- Why is 1 bar approximately 29.53 inhg instead of exactly 30?
- What formula should I use to convert pressure from bar to inhg?
- Is the conversion from 1 bar to inhg affected by temperature?
- How does 1 bar compare to inhg in weather measurements?
Conversion Definitions
Bar: A bar is a unit of pressure, equal to 100,000 pascals, used widely in meteorology and engineering. It is slightly less than atmospheric pressure at sea level and provides a convenient measure for various pressure ranges without using the pascal’s large values.
Inches of Mercury (inhg): Inches of mercury is a pressure unit based on the height of mercury in a column, where 1 inhg equals the pressure exerted by a mercury column 1 inch tall at standard gravity. It is often used in weather forecasting and aviation pressure readings.
Conversion FAQs
Does temperature affect the bar to inhg conversion?
While pressure units themselves are standard, temperature can influence mercury’s density and expansion slightly, but for practical bar to inhg conversions, temperature effects are negligible and not usually accounted for.
Why is the conversion factor approximately 29.53 and not a whole number?
The factor comes from the physical properties of mercury and the exact definition of the bar in pascals. Mercury’s density and gravity combine to give a precise but non-integer conversion ratio, reflecting real-world measurement standards.
Can I use this conversion for pressures below atmospheric level?
Yes, negative bar values convert just the same way to negative inhg values, representing pressures below atmospheric. The formula is linear and applies for any numeric value in bar.
Is the conversion the same for all altitudes?
The units themselves don’t change, but actual pressure values measured can vary with altitude. The conversion factor stays constant; however, the pressure in bar or inhg at different altitudes differs because of atmospheric changes.
How precise is the conversion factor used here?
The factor 29.529983071445 is highly precise based on standard definitions, sufficient for most scientific and engineering applications. Minor variations might exist in local gravitational acceleration but are usually ignored.