Balloon descent:
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Air is let through the regulator
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Helium balloon
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Balloon inflating
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Small compressor blowing air
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Air is bleeding through a hose
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Compressor discharges air, Construction
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Wind tunnel ventilation
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Air is blown through a glass tube
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Mask breathing
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Cut through the air with a gas burner
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Fighting the fire with blacksmith furs
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Air flow
★★★★★