The diver paints the underwater part of the vessel using a paint sprayer underwater.

The diver paints the underwater part of the vessel using a paint sprayer underwater. Determine at what pressure the paint should be supplied to the sprayer if the work is done at a depth of 2.5 m.

To find the required pressure to supply paint to the spray gun, we apply the formula: P = Pa + Pw = Pa + ρmw * g * h.

Constants and variables: Pa – standard atmospheric pressure (Pa = 101325 Pa); ρmw is the density of seawater (ρmw = 1030 kg / m3); g – acceleration of gravity (g = 9.81 m / s2); h (depth at which the vessel is painted) = 2.5 m.

Calculation: P = Pa + ρmv * g * h = 101325 + 1030 * 9.81 * 2.5 = 126.585.75 Pa ≈ 126.6 kPa.

Answer: The paint must be applied at a pressure of at least 126.6 kPa.