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Use corrugated flow channels whose geometric design is so tuned to generate an acoustic emission whose frequency varies as a function of the gas flow velocity. The corrugation of a pipe is sized to generate a series of tones for a given velocity range.

Ice crystals

The widespread use of inexpensive salt hydrate-based phase change materials, or PCMs, has been prevented by a key technical challenge: phase separation, also known as incongruency, which results in the significant degradation of the materials' ability to store thermal energy o