water hammer
Noun: 1. A hydraulic shock phenomenon: A pressure surge or wave caused when a fluid (typically water) in motion is forced to stop or change direction suddenly. This rapid change in momentum creates a shockwave that travels through the pipes, often producing a loud banging or hammering sound. 2. The resulting sound: The loud, distinct knocking or hammering noise produced by this hydraulic shock within a piping system.
- Noun:
- The loud water hammer from the pipes woke everyone up when the washing machine's valve shut off.
- Plumbers install air chambers to prevent water hammer in the system.
- You can often hear a water hammer when you quickly turn off a faucet.
- Technical Context: In engineering, "water hammer" is analyzed to calculate potential stress on pipes, valves, and fittings to prevent system failure. It is a critical consideration in the design of pipelines, plumbing, and industrial fluid systems.
- Cause and Effect: The term is often used to describe both the cause (the pressure surge) and the effect (the audible noise). For example: "The water hammer (cause) damaged the valve," and "We need to fix the water hammer (noise) in the kitchen."
- Hydraulic Shock: A more technical synonym for the phenomenon itself.
- Water Ram: An older or less common term for the same effect.
- Hammer Arrester / Water Hammer Arrestor: A device specifically designed to absorb the shock and eliminate the noise.
- Pipe hammer (informal, descriptive)
- Hydraulic surge
- To cause water hammer: The action that creates the shock.
- Closing that valve too quickly will cause water hammer.
- To have water hammer: Describes a system experiencing the problem.
- Our plumbing has water hammer whenever the dishwasher finishes.
While "water hammer" is a compound noun, it functions as a single, fixed lexical unit with this specific technical meaning. The reference to "steam" in some definitions is related but less precise; the core phenomenon involves the sudden stoppage of any moving liquid column, with water being the most common in domestic and many industrial contexts. The sound is the most commonly perceived symptom of the underlying hydraulic event.
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the banging sound of steam in pipes
