How do you convert 3.5" water column into psig?

To convert inches of water column (in. WC) to pounds per square inch gauge (psig), it's important to understand the conversion factors involved.

1 inch of water column is equivalent to approximately 0.0361 psi. Therefore, to convert 3.5 inches of water column to psig, you would multiply the number of inches by the conversion factor:

3.5 in. WC * 0.0361 psi/in. WC = 0.12635 psi

When rounded, this result is approximately 0.13 psi. In the context of the options provided, 1/4 psig is equivalent to 0.25 psi, which is close to the calculated value of 0.13 psi, affirming that this conversion is consistent with typical findings in gas pressure measurements.

This understanding helps in practical applications, such as ensuring safe and efficient operation of gas appliances where pressure levels must be monitored accurately.