Engineering acoustics relies on core fundamental metrics and equations to quantify sound pressure, energy, impedance, and room characteristics. spl, sound pressure level reference acoustic pressure by medium Medium Reference Pressure, prefp_{ref} in ozf/in2 or osi Air 46.4 billionths Freshwater 2.32 billionths Seawater 2.32 billionths Sound Source SPL (dB) RMS acoustic pressure (osi) 140 130 120…