On+or+in+the+water
71Water hammer — (or, more generally, fluid hammer) is a pressure surge or wave resulting when a fluid in motion is forced to stop or change direction suddenly (Momentum Change). Water hammer commonly occurs when a valve is closed suddenly at an end of a pipeline …
72Water conservation — refers to reducing the use of water.The goals of water conservation efforts include: * Sustainability To ensure availability for future generations, the withdrawal of fresh water from an ecosystem should not exceed its natural replacement rate. * …
73Water activity — or aw is a measurement of the energy status of the water in a system. It is defined as the vapor pressure of water above a sample divided by that of pure water at the same temperature; therefore, pure distilled water has a water activity of… …
74Water potential — is the potential energy of water per unit volume relative to pure water in reference conditions. Water potential quantifies the tendency of water to move from one area to another due to osmosis, gravity, mechanical pressure, or matrix effects… …
75Water birth — is a method of giving birth, which involves immersion in warm water. Proponents believe this method to be safe and provides many benefits for both mother and infant, including pain relief and a less traumatic birth experience for the baby.… …
76Water organ — The water organ or hydraulic organ (early types are sometimes called hydraulis, hydraulos, hydraulus or hydraula) is a type of automatic pipe organ blown by air, where the power source pushing the air is derived by water from a natural source… …
77Water resources of Singapore — The water resources of Singapore are especially precious given the small amount of land and territory in Singapore s geography while having a large urban population in the city state.Without natural freshwater rivers and lakes, the primary… …
78Water Resistant mark — Water Resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against ingress of water. It is usually accompanied by an indication of the static test pressure that a sample of newly manufactured… …
79Water resources of the People's Republic of China — The Water resources of China are affected by pollution, contamination and regional scarcity. Water resources management is fragmented among various agencies and levels of government. Water quality The quality of groundwater or surface water is a… …
80Water tank — Towers, featured in Kuwait City Water tank used in Municipal W …
