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## Main Question or Discussion Point

A large tank filled with air is compressed to 49 PSI. A valve is open and air escapes through the hole (d = 0.04 ft) to the atmosphere. How long will it take for the compressed air to reach 29 PSI.

Assume constant temperature.

Not exactly sure how to approach this problem since the flow rate will change as the pressure changes.

I've been trying to use Bernoulli's Equation to get velocity and therefore flowrate, but that is instantaneous velocity so it doesn't help much. If anyone could point me in the right direction that would be much appreciated.

Assume constant temperature.

Not exactly sure how to approach this problem since the flow rate will change as the pressure changes.

I've been trying to use Bernoulli's Equation to get velocity and therefore flowrate, but that is instantaneous velocity so it doesn't help much. If anyone could point me in the right direction that would be much appreciated.