Steam:
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Balloon inflating
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A stream of air breaks out of a metal pipe
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Wind tunnel ventilation
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Fighting the fire with blacksmith furs
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Air release with a loud whistling creak,
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Helium balloon
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Air is let through the regulator
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Air pressure
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Oxygen balloon
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Truck Air Brakes
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Compressor discharges air, Construction
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Steam
★★★★★