Water is forced out of a fire extinguisher by air pressure...

Water is forced out of a fire extinguisher by air pressure as shown in Figure P15.53. How much gauge air pressure in the tank is required for the water jet to have a speed of $30.0 \mathrm{m} / \mathrm{s}$ when the water level is $0.500 \mathrm{m}$ below the nozzle?

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Key Concepts

Bernoulli's Equation

Bernoulli's Equation is a fundamental principle in fluid dynamics that establishes a relationship between pressure, velocity, and elevation in a flowing fluid. It is used to understand how changes in pressure can be converted into kinetic energy (and vice versa) along a streamline, which is essential for determining the speed of a fluid jet when driven by pressure differences.

Hydrostatic Pressure

Hydrostatic pressure refers to the pressure exerted by a fluid at rest due to the gravitational force. It increases with depth in the fluid and contributes to the overall pressure head that drives the fluid flow. This concept is important when considering the fluid’s potential energy associated with its elevation relative to the outlet.

Gauge Pressure

Gauge pressure is the pressure measurement relative to the ambient atmospheric pressure, rather than absolute zero. In many practical applications, such as pressurizing a fluid system, it is the excess pressure (over atmospheric pressure) that is important for inducing flow or keeping the fluid in motion. This concept is crucial in determining the additional internal pressure required in closed systems like a fire extinguisher.

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