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If we have a compressed air tank of 550 kPa with a opening area of 0.25 cm^2, would the force provided just be P*A so it'd just be 550 * 0.25 (with appropriate conversions to metres and pascals etc). We are looking for the force that'd be provided to a model car that the tank (from a paintball gun) is attached to.

???

Or is it something a little bit more complicated than that. This isn't a homework question where we need an exact answer, we only need to estimate it.