A barometer is a device for measuring atmospheric pressure - NOT distance or depth !
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A 28 meter square is 28 times 28 meters or 784 square meters. If it is one tenth of a meter (10 cm) deep, it has a volume of 78.4 cubic metersIf you mean 28 square meters (like a pool 4 meters by 7 meters) then the volume one tenth of a meter deep is 2.8 cubic meters.
3 meters is approximately 9'10" (9 feet, 10 inches)
10 x 20 x 1
10*5*3 = 150 cubic metres
If the 25 meters is a circle, it would be 68256 gallons