Dividing 1 by 0.0361 equals 27.7
The division says there are 27.7 parts of 0.0361 in every 1
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Multiply inches of WC by 0.0361 to obtain PSI.
Multiply by 0.036 http://www.enercongroup.com/conversion_factors.htm One PSI is equal to 27.7 inches of water column
.4 psi
50 gallons
You need to multiply by 0.036. So 5 x 0.036=.18 psi