What is the pressure (in atm) at 300 feet below sea?
I am getting all kind of different information from online sources, such as that every 10 feet below water equals to 1 atm. Is this true? What is the pressure at 300 feet below sea surface?
- MugwumpLv 78 years agoFavorite Answer
An atmosphere is just the standard atmospheric pressure at sea level. It is equal to 101 325 Pascal. A Pascal is a Newton per square meter.
The pressure under water is simply the density times gravity times the depth (d * g * h)
The density of sea water is about 1025 kg/m^3, I believe.
So if Pressure (P) = d * g * h,
then depth (h) = P / (d * g)
h = 101 325 Pa / (1025 kg/m^3 * 9.81 m/s^2)
h = 10.08 METERS, not feet (That's 33 feet)
Since we are working in metric, lets change your 300 feet to meters
300 feet * .304 m/foot = 91.2 meters
So P = d * g * h
P = 1025 kg/m^3 * 9.81 m/s^2 * 91.2 m * 1 atm/101 325 Pa
P = 9.05 atm