30 inHg is equal to approximately 14.7059 psi.
This conversion is based on the relationship between inches of mercury (inhg) and pounds per square inch (psi). Since 1 inHg equals 0.491154 psi, multiplying 30 by this factor gives the equivalent pressure in psi.
Conversion Tool
Result in psi:
Conversion Formula
The formula to convert inches of mercury (inhg) to pounds per square inch (psi) is:
psi = inhg × 0.491154
This works because 1 inHg is defined as the pressure exerted by a mercury column of one inch height at standard gravity, which equals about 0.491154 psi. Multiplying the given inhg value by this constant converts it to psi.
Example calculation for 30 inHg:
- Start with 30 inHg
- Multiply by conversion factor: 30 × 0.491154 = 14.73462 psi
- Rounded to four decimals: 14.7346 psi
Conversion Example
- Convert 45 inHg to psi:
- Multiply: 45 × 0.491154 = 22.10193 psi
- Rounded: 22.1019 psi
- Convert 10 inHg to psi:
- Multiply: 10 × 0.491154 = 4.91154 psi
- Rounded: 4.9115 psi
- Convert 25 inHg to psi:
- Multiply: 25 × 0.491154 = 12.27885 psi
- Rounded: 12.2789 psi
- Convert 50 inHg to psi:
- Multiply: 50 × 0.491154 = 24.5577 psi
- Rounded: 24.5577 psi
Conversion Chart
| inhg | psi |
|---|---|
| 5.0 | 2.4558 |
| 10.0 | 4.9115 |
| 15.0 | 7.3673 |
| 20.0 | 9.8231 |
| 25.0 | 12.2789 |
| 30.0 | 14.7346 |
| 35.0 | 17.1904 |
| 40.0 | 19.6462 |
| 45.0 | 22.1020 |
| 50.0 | 24.5577 |
| 55.0 | 27.0135 |
The chart shows inhg values in the left column and their equivalent psi values to the right. Use it to quickly find the psi equivalent by looking up the inhg value, without doing calculations.
Related Conversion Questions
- How many psi is 30 inches of mercury?
- What pressure does 30 inhg equal in psi units?
- Can I convert 30 inhg directly into psi?
- What is the psi equivalent of 30 inhg for tire pressure?
- How to change 30 inhg pressure reading into psi?
- Is 30 inhg higher or lower than 30 psi?
- What formula converts 30 inhg to psi?
Conversion Definitions
inhg: Inches of mercury measures pressure by the height of a mercury column in inches. It is used in barometers and vacuum gauges, representing pressure exerted by mercury under gravity. It’s common in meteorology and engineering to express pressures below or above atmospheric.
psi: Pounds per square inch quantifies pressure as force in pounds applied over an area of one square inch. Used widely in mechanical systems, tires, hydraulics, and pneumatics, psi expresses pressure in units more practical for everyday applications than pascals or bars.
Conversion FAQs
Why is inhg used instead of psi in some pressure measurements?
inhg is favored in some fields like meteorology because it directly relates to mercury column height, which is easy to measure with barometers. psi measures force over area, better for mechanical systems. The choice depends on the measurement context and required precision.
Does temperature affect the conversion between inhg and psi?
Temperature can slightly change mercury density and pressure readings, but for most practical conversions, the effect is negligible. The conversion factor 0.491154 assumes standard conditions, so large temperature deviations might cause minor inaccuracies.
Can I convert negative inhg values to psi?
Negative inhg values represent pressures below vacuum or gauge references, and can be converted mathematically using the same formula. However, physical interpretation depends on the pressure reference used and application context.
Is the conversion factor 0.491154 exact for all conditions?
The factor is based on standard gravity and mercury density at room temperature. In extreme environments, variations in gravity or mercury properties can slightly affect accuracy, but for common scenarios, this factor provides a reliable conversion.
How do I convert psi back to inhg?
To convert psi to inhg, divide the psi value by 0.491154. This reverses the multiplication step, giving the equivalent mercury column height corresponding to the psi pressure.