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The bubbles rise slower if we add some foamer. For example, the bubble with diameter 0.9mm rises (without a foamer) with 0.20 m/s, and 0.11 m/s with a foamer.
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The bubbles rise slower if we add some foamer. For example, the bubble with diameter 0.9mm rises (without a foamer) with 0.20 m/s, and 0.11 m/s with a foamer.