Oxygen balloon:
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Air is blown through a glass tube
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Compressor discharges air, Construction
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Inflating a mattress
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Air is let through the regulator
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Balloon descent
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Suction action of air
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The release of, The work of oxygen equipment
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Air pressure
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Steam
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Small compressor blowing air
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Balloon inflating
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Cylinder pressure, Air compressor, air bleed
★★★★★