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Water degassing techniques - description

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When doing ultrasound work and the sound waves must pass through water, it is important to used gegassed (outgassed) water. This can be done by one of several methods. One is to make the pressure above the water sample as low as possible, i.e., a partial vacuum. The other is to boil the water at normal pressures. Discuss the physics behind these degassing techniques.

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Degassing is the process of removing small suspended gas bubbles and dissolved gas from a liquid prior to use.

Liquids can be degassed by raising the temperature. As you heat water, the gas molecules dissolved in it rises up; as the heating progresses with time, bubbles grow to a size ...

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