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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.

    © BrainMass Inc. brainmass.com December 24, 2021, 4:50 pm ad1c9bdddf
    https://brainmass.com/physics/atoms-molecules/water-degassing-techniques-description-10342

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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 sufficient to allow them to rise up through the liquid, against gravity, until they reach the surface, rise through, and go out.

    When a system is in equilibrium, a change in one of the factors like temperature, pressure, or concentration, will cause the equlibrium to shift in such a way as to diminish the effect of the change. As you decrease the pressure, the dissolved gas molecules will move up to the interfeace betwen the water and air.

    Providing a vacuum above the gas-liquid interface (surface) greatly enhances degassing and requires both a pulse-free (constant pressure) vacuum source and a means of disposing of the extracted gases if they are in any way environmentally unsafe.

    As the pressure decreases, the dissolved gases rise up and the liquid is degassed.

    Small bubbles will not be seen rising to the liquid surface during ultrasonic operation in a completely degassed liquid.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 4:50 pm ad1c9bdddf>
    https://brainmass.com/physics/atoms-molecules/water-degassing-techniques-description-10342

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