Consider an ancient, rigid, but sealed jar resting 80 ft below the surface of the ocean. If the specific gravity of sea water is 1.025 and the barometric pressure is 14.7psia, determine the absolute pressure acting on the jar (in psia).
Here is a calculator for you.
http://www.calctool.org/CALC/other/games/depth_press
I already know the answer is 50.3 psi (absolute) I just need some help getting to that point.
I gave you a link that is a calculator to do this for you. Are you telling me you can't type in 80 for the depth, hit the units bar and select feet, hit the calculate button and you get a psi in atm but you can hit the units bar again and choose psi. It shows 50.3.Or have I misunderstood what you want?
To determine the absolute pressure acting on the jar, we need to consider two factors: the hydrostatic pressure exerted by the sea water above the jar and the atmospheric pressure.
First, let's calculate the hydrostatic pressure. The hydrostatic pressure is directly proportional to the depth and the density of the liquid.
The formula to calculate hydrostatic pressure is:
P = ρgh
Where:
P is the pressure
ρ is the density of the liquid (sea water in this case)
g is the acceleration due to gravity (approximately 32.2 ft/s^2)
h is the depth of the jar below the surface of the water (80 ft in this case)
Plugging in the values, we get:
P = (1.025 * 32.2 ft/s^2 * 80 ft)
Now, let's calculate the atmospheric pressure. Barometric pressure is the atmospheric pressure at sea level, which is typically around 14.7 pounds per square inch absolute (psia). So, we can use this value directly.
Now, to determine the absolute pressure acting on the jar, we need to add the hydrostatic pressure and the atmospheric pressure together.
Absolute pressure on the jar = Hydrostatic pressure + Atmospheric pressure
Substituting the values, we have:
Absolute pressure on the jar = (1.025 * 32.2 ft/s^2 * 80 ft) + 14.7 psia
Now, we can calculate the absolute pressure on the jar by adding these two values together.