. Find the approximate height of water upstream of the dam or the headwater in meters, such that an air bubble, upon reaching the water surface has a volume of 7 times than it had at the bottom?   Do not write the unit. You will only input the numerical answer in the space provided. Unit of the Correct Answer: m

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A:

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.