Water has a density of 1 gram per cubic centimeter. There are 1,000,000 cubic centimeters in a cubic meter, so 1 cubic meter has a mass of 1000 kilograms.
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about the same as a gallon of water: 8+ lbs
That would depend on the temperature and is this fresh or sea water? About 305.72
25 kg/m2 is a density of a toughened glass with 10 mm thick. If you want convert that measure into kN, then multiply by the factor "g" that is gravity (9.81 m/s2) and you get 25 x 9.81 = 245.25 kN/m2.
It takes 2L of water to make 1 kg of concrete. That is approximately 4800L per cubic meter.
A square foot cannot hold water its 2 dimensional. What you see is what you get . A one cubic foot container can hold 7.48 US gallons of liquid.