# How do I calculate pressure?

#### Turkish

##### Lifer
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
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
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
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
1 Pa = 1 N/(m^2)

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