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The weight of one square foot of water is zero pounds. A square foot is a measurement of area, not volume. Since a square foot has no height, it is not possible to fit even a single hydrogen atom inside a square foot.

The weight of a cubic foot of water (a cube with each side equal to one foot) is about 62.42 pounds. The reason that I saw "about" is because the density of water changes according to its temperature, so that a cubic foot of water at 32 degrees Fahrenheit will weigh 62.42 pounds, but at 212 degrees Fahrenheit a cubic foot of water weighs 59.83 pounds.

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Q: What is the weight of one square foot of water?
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One inch of rain over one square foot is 1/12 cubic foot of water. A cubic foot of water weighs about 62.4 pounds. 1/12 of that is about 5.2 pounds.

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What is the density of jello in pounds per square foot or kilograms per square meter?

You can estimate this answer closely. Jello is more dense than water. If you know the density of water per square foot, add something to that number (maybe double). Another way to estimate it would be this: Have you ever picked up a bowl of jello? How much do you think it weighed? (without the bowl, of course.) You can compare the weight of a bowl of jello to anything that you know the weight of, such as a three-pound weight that you use to exercise. Estimate how many bowls of jello it would take to make one square foot. Then multiply that number by how many pounds one bowl of jello weighs.