How do I calculate pressure?

Turkish

Lifer
May 26, 2003
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I kinda know the answer but I want to be sure. How can I calculate the pressure exerted by 1 km of water ? I know pressure = density X gravity acceleration X depth. So pressure must be equal to: 1000 kg/m3 X 9.8 m/s^2 X 1000 m = 9,800,000 kg/m/s^2? Right? This will be equal to 9,800,000 pascal? I wanna be sure the units are right.
 

dullard

Elite Member
May 21, 2001
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3,408
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Originally posted by: Xiety
I kinda know the answer but I want to be sure. How can I calculate the pressure exerted by 1 km of water ? I know pressure = density X gravity acceleration X depth. So pressure must be equal to: 1000 kg/m3 X 9.8 m/s^2 X 1000 m = 9,800,000 kg/m/s^2? Right? This will be equal to 9,800,000 pascal? I wanna be sure the units are right.

Yes 1 Pa = 1 kg/(m*s^2)
 

raptor13

Golden Member
Oct 9, 1999
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Are you asking what the pressure is at a depth of 1000m? If that's the case, then what you did is correct.


EDIT: Depending on how accurate you're supposed to be, the values you used for the acceleration of gravity and the density of water aren't as precise as they could be. At standard conditions, water has a density of 998kg/m^3, I believe.
 

Turkish

Lifer
May 26, 2003
15,549
1
81
Originally posted by: raptor13
Are you asking what the pressure is at a depth of 1000m? If that's the case, then what you did is correct.


EDIT: Depending on how accurate you're supposed to be, the values you used for the acceleration of gravity and the density of water aren't as precise as they could be. At standard conditions, water has a density of 998kg/m^3, I believe.

yeah i did it for the depth of 1000 m... well, i dont have to be that accurate ;)

thanks to both of you.
 

miniMUNCH

Diamond Member
Nov 16, 2000
4,159
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1 Pa = 1 N/(m^2)

1 N = (kg-m)/(s^2) <-- units of force = mass (kg) time acceleration (m/s^2)