- #1
FollowTheFez
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I am going through old exam questions about pressure and fluid dynamics.
For one particular question I had to calculate the change in pressure in a system. These two equations were given on the formula sheet:
ΔP=[itex]\frac{4\gamma}{R}[/itex]
and
ΔP=[itex]\frac{2\gamma}{R}[/itex]
I've never seen the equation with the '4' in it. I've only every used the second equation to calculate pressure change (and always got answers correct). I can't find the first equation anywhere in my textbook or study guide.
I was wondering if someone could briefly explain when you would use that equation?
I am assuming that it's got something to do with where the pressure difference is only half (e.g. half a bubble sitting on top of water)?
For one particular question I had to calculate the change in pressure in a system. These two equations were given on the formula sheet:
ΔP=[itex]\frac{4\gamma}{R}[/itex]
and
ΔP=[itex]\frac{2\gamma}{R}[/itex]
I've never seen the equation with the '4' in it. I've only every used the second equation to calculate pressure change (and always got answers correct). I can't find the first equation anywhere in my textbook or study guide.
I was wondering if someone could briefly explain when you would use that equation?
I am assuming that it's got something to do with where the pressure difference is only half (e.g. half a bubble sitting on top of water)?