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5-Regular Member

## Dealing with Gauge and Absolute Pressures

Have any of you guys got a good solution for being able to distinguish psig and psia in a worksheet? I would like to be able to define the local atmosphere in the sheet and then work with either the gauge or absolute pressures in the sheet. Seems like this should be simple but an elegant solution is eluding me.  Thanks!

1 ACCEPTED SOLUTION

Accepted Solutions
23-Emerald I
(To:Eric_S)

If both psia and psig are effectively 'Pounds per square inch' then Mathcad cannot tell the difference between them.

That should not hold you from defining each as that unit, so:

psia:=psi

psig:=psi

and using them, but you'll have to keep track of which is which yourself, as Mathcad will set the unit of any computed results using variables with those units to Pa (The SI unit for pressure), or psi (if you've chosen US units).

Success!
Luc

2 REPLIES 2
23-Emerald I
(To:Eric_S)

If both psia and psig are effectively 'Pounds per square inch' then Mathcad cannot tell the difference between them.

That should not hold you from defining each as that unit, so:

psia:=psi

psig:=psi

and using them, but you'll have to keep track of which is which yourself, as Mathcad will set the unit of any computed results using variables with those units to Pa (The SI unit for pressure), or psi (if you've chosen US units).

Success!
Luc

5-Regular Member
(To:LucMeekes)

Thank you, @LucMeekes ! This helps.

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