Which statement correctly defines static pressure?

Which statement correctly defines static pressure?

• A. It is the pressure of water when it is moving
• B. It is the pressure at the discharge opening while water is flowing
• C. It is the pressure of water when it is not moving
• D. It is the atmospheric pressure

Answer: (C)

Static pressure is the pressure in the water system when no water is moving. It represents the potential energy available to push water through the pipes and hoses once a valve is opened. When water begins to flow, velocity and friction losses come into play, changing the pressure from this resting value. That’s why the statement describing water pressure at rest is the correct definition. The other descriptions refer to pressure during flow or to atmospheric pressure, which are not static pressure.

Static pressure is the pressure in the water system when no water is moving. It represents the potential energy available to push water through the pipes and hoses once a valve is opened. When water begins to flow, velocity and friction losses come into play, changing the pressure from this resting value. That’s why the statement describing water pressure at rest is the correct definition. The other descriptions refer to pressure during flow or to atmospheric pressure, which are not static pressure.