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What is the difference between bubblepoint and dewpoint?

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Both bubblepoint and dewpoint are saturation pressures for mixture of hydrocarbon and non-hydrocarbon components.

At a given temperature, the condition occurs when an oil releases an infinitesimal bubble of gas from solution when pressure drops below the saturation pressure. This pressure called bubblepoint.
At a given temperature, the condition occurs when a gas condenses an infinitesimal drop of oil from solution when pressure cross the saturation pressure line. This pressure called dewpoint.

See more at saturation pressure.

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