| 1. | The object here is to smooth the surface and remove air bubbles.
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| 2. | Then the particles are brought to the water surface by air bubbles.
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| 3. | This creates tiny air bubbles that are almost impossible to brush out.
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| 4. | :Could this not merely be lots and lots of tiny air bubbles?
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| 5. | Engineers believe an air bubble became trapped in a critical hydraulic line.
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| 6. | In the process, air bubbles are trapped, giving ice an opaque appearance.
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| 7. | The head box also provides a means allowing air bubbles to escape.
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| 8. | Another possibility is that an air bubble became trapped in the line.
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| 9. | An embolism is where an air bubble is created in a tracheid.
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| 10. | Work at low speed to avoid creating too many air bubbles.
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