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Assuming that both the floor and the upper rim are exactly the same size and the walls surrounding the tub are straight in a vertical direction, the tub is a cylinder. Here is the equation: h * r^2 * pi Where h is the height of the tub, r^2 is the radius (half of the tub's diameter) squared, and pi is, of course, approximately 3.14
Code P0442: Evaporative Emission System Leak Detected (small leak) One common cause for this can be a loose or poorly sealing gas cap. Also there is supposed to be a soft rubber o-ring type gasket on the gas cap, that seals against the filler neck. If it is missing or damaged it may leak. Old, dried, and cracked rubber hoses anywhere in the system may also account for the leak.
It depends on the width of your tub. The distance would be so that your shower curtain would hang in the middle of the edge of the tub.
If you multiply the three numbers, you get the volume - assuming the tub has a "block" (rectangular) shape.
A leak probably wouldn't cause a "sudden" drop in pressure. It sounds more like the system has more users than it can supply and pressure drops when someone else turns on their shower or flushes their toilet.