Cross Connection Practice Exam

What is the maximum height water can be raised due to a perfect vacuum?

1. 25.4'

2. 31.8'

3. 33.9'

4. 36.7'

The correct answer is: 33.9'

The maximum height that water can be raised due to a perfect vacuum is based on the hydrostatic pressure principle and the weight of the water column. A perfect vacuum can theoretically support a column of water to a height of approximately 33.9 feet (10.34 meters) at sea level. This height is derived from the atmospheric pressure, which exerts a force on the liquid surface. The atmospheric pressure at sea level is about 14.7 psi, and when creating a perfect vacuum above the column of water, this pressure can support the weight of the water. The calculation considers the density of water and the gravitational force acting on it. In practical terms, this height is the maximum one can reach under ideal conditions without any other influences, such as atmospheric variations or additional pressures. Understanding this concept is crucial for applications involving water systems, such as in plumbing and irrigation, where vacuum conditions may be encountered.