ASSE Backflow Recertification Practice Exam

Question: 1 / 400

One atmosphere of pressure is equivalent to how high of a column of water at sea level?

33.8 feet

One atmosphere of pressure, which is equivalent to 101.3 kPa or 14.7 psi, can support a column of water due to the weight of the water above it. At sea level, this pressure can support a column of water approximately 33.8 feet tall.

This measurement is derived from understanding the density of water and the gravitational force acting on it. Water has a density of about 62.4 pounds per cubic foot, and when you calculate the height of the water column that corresponds to one atmosphere of pressure, it is found to be approximately 33.8 feet.

This relationship between atmospheric pressure and the height of a water column is fundamental in fluid dynamics and hydraulics, and it’s essential for anyone working in backflow prevention and related fields to grasp this concept. Understanding how pressure relates to fluid height and the implications for backflow devices are crucial in ensuring the safety and efficacy of water systems.

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15.5 feet

20.5 feet

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