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- Thread starter the_android
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- #2

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Pressure is force per unit area (or in some cases given as mass per unit area). Your equation ignores the mass of fluid and the area over which it is applied.

All your equation does is reduce the depth by an order of magnitude.

If anyone else knows how your equation works (or yourself) please do explain, otherwise I'd have to say it's useless.

1kg of water applied to 1m

- #3

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afaik, at zero depth (shoreline) the pressure is 1 atmosphere and at the depth of ten meters the pressure have doubled roughly to 2 so with this formula i've calculated that the pressure at 5 meters the pressure would be roughly 1,5 and at 53 meters the pressure would be 6,3. if i need another formula don't hesitate to correct me. i even missed +1 at the end of it.

P=depth*0,1+1

now i get it to work

P=depth*0,1+1

now i get it to work

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i now noticed that the formula is very crude and not working properly. i think this thread clearly shows my lack of education in the matter. but i still need a working formula. any thoughts?

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- #5

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(hmm for some reason I can't get tex working)

p = p0 + rho * g * h

where p0 = initial pressure, in this case 1 bar

rho = density of water = 1000 kg/m3

g = gravity acceleration = 9.81 m/s^2

h = depth which you want the pressure at.

So we plug those in and get

p = 1bar + 9810Pa * h and then we convert 9810Pa into bars

p = 1 bar + 0,0981*h

As you can see the approximation varies depending on which values you use for the g and rho.

- #6

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ok, thanks. now i have a better understanding on matter :)

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