Answer:
431 kg/m³
Explanation:
Hydrostatic pressure (P) is equal to the density of the fluid (ρ) times the acceleration due to gravity (g) times the depth of the fluid (h).
P = ρgh
ΔP = ρgΔh
132,100 Pa − 115,200 Pa = ρ (9.8 m/s²) (4.00 m)
ρ = 431 kg/m³