Helikiirus voolises ei suuda taluda nihkejõude, heli liigub pikisuunaliste survelainetena, mille tõttu täpne helikiirus sõltub suuresti konkreetse keskkonna olekust, temperatuurist ja koostisest.
The speed of sound in fluid cannot sustain shear forces, sound travels as longitudinal pressure (compression) waves. The exact propagation velocity relies heavily on the state, temperature, and composition of the specific medium.
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