20 cm of water is about 1.96 kPa.
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kPa is pressure, how much area is the pressure acting on
1000 m. of pure water = 100 bar plus atmospheric pressure at say 1 bar = 101 bar. Seawater will be more because the density is higher.
Errrh, would it be a gallon of water?
50 gallons
basically 38 divided by 40 which equals 0.95 grams