29. Pneumatic or Hydraulic Construction
A. Replace solid parts of an object by gas or liquid. These parts can use air or water for inflation, or use air or hydrostatic cushions.
Example:
• Comfortable shoe inserts with gel.
• Store energy from decelerating a vehicle in a hydraulic system, and then use the stored energy to accelerate later.
• To increase the draft of an industrial chimney, a spiral pipe with nozzles was installed. When air flows through the nozzles, it creates an air like wall, reducing drag.
• For shipping fragile products, air bubble envelopes or foam like materials are used.
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