Convert the 26 in Hg value in terms of psia to an approximate value as follows: psia = in Hg 2 Here, in Hg is the unit of pressure in inches of mercury. Substitute 26 in Hg for in Hg.. psia 26 2 = 13 psia Therefore, the approximate value for the pressure in in Hg in terms of psia is 13 psia
The Correct Answer and Explanation is :
To convert a pressure reading from inches of mercury (inHg) to pounds per square inch absolute (psia), we use the conversion factor:
1 inHg ≈ 0.491154 psia. (Convert Units)
Calculation:
For a pressure of 26 inHg:
26 * 0.491154 = 12.770004 psia
Therefore, 26 inHg is approximately equal to 12.77 psia.
Understanding the Conversion:
The conversion factor arises from the relationship between the two units:
- Inches of Mercury (inHg): A unit of pressure defined as the pressure exerted by a column of mercury 1 inch high at 0°C under standard gravity.
- Pounds per Square Inch Absolute (psia): A unit of pressure that measures the force exerted per square inch of area, relative to a perfect vacuum.
The factor 0.491154 comes from the fact that 1 inHg is equivalent to 0.491154 psia. (Convert Units)
Application:
This conversion is particularly useful in fields like meteorology, aviation, and engineering, where pressure measurements are often taken in inHg, but calculations require psia.
Note:
Ensure that the pressure readings are in absolute terms when using this conversion. Gauge pressures, which are measured relative to atmospheric pressure, would require additional adjustments.