Judging from the picture of a regular Campbell's can, where the letters are oriented and how large they are compared to the can itself, one can assume that the height of the bike is roughly one third the length of the diameter of the large Campbell's can. Further, one can estimate the height of the bike to be 3 feet. Thus, the diameter of the large soup can looks to be about 9 ft. Since the height of the Campbell's soup can appears to be twice the diameter, we can assume that the height of the large soup can is around 18 ft. Using these dimensions, and the formula for the volume of a cylinder ( Volume = pi*(d/2)*h), we calculate that the total amount of water that the large soup can can hold is pi*(9/2)*18 = 254.5 cubic feet.
Thus, our estimation of the dimensions o the large Campbell's soup can is 9 ft in diameter, 18 ft tall, and can hold up to 254.5 cubic feet of water. Converting this volume to liters, we have that it can hold roughly 254.5*28.3168 = 7205.75 litres of water!
Pretty good -- although there are quite a few assumptions based on visual observations. These might prove to be correct, but it would be good to check them even by using 'rule-of-thumb' measurements with your thumb on the screen, etc.
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