# Simple Static Pressure problem, need help with units

## Homework Statement

Hi i'm having trouble solving this physics problem if anyone can help it would be greatly appreciated !

Static pressure problem: A bathtub contains water to a depth of 20 inches. Determine the pressure at the bottom of the bathtub in both [psia] and [psig] (a being absolute pressure and g being gauge pressure)

im using P=pgh

## The Attempt at a Solution

what i've tried doing was to find gauge pressure first: P=pgh=(1.94slug/ft^3)(32.2ft/s^2)(1.67ft). I got the 1.67 feet from converting 20 inches to feet. the answer i get is 104.11slug/s^2 but they want it in psi or lb/in^2 and i am having trouble converting these units =[

Why don't you just convert the initial 20 inches to meters then solve for the standard SI units?

Well the problem is that i don't know how to get rid of the /s^2 in my final answer and even if i use the standard SI units ill still come up with an answer that has /s^2

That's the acceleration…s^2 is an SI unit.

Also…

look at the definition of what a pound actually is (in terms of units). That should fix things.

SteamKing
Staff Emeritus