Negative (absolute) acoustic pressure in ultrasonic waves?
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In water, as in solids, you can have a state of tension as well as compression. If the amplitude of the acoustic wave is larger than the static pressure, you can have a state of "negative pressure" around the minimum of the acoustic pressure.
This is better described as a state of tension in the medium. Depending on the situation (purity, temperature) water cans sustain some amount of stretching. If some threshold is reached, cavitation occurs. This is one of the reason a too high pressure may be dangerous. The mechanical index of the ultrasound beam quantifies this danger, as it is expressed in terms of the minimum pressure of the ultrasound peak.
This is better described as a state of tension in the medium. Depending on the situation (purity, temperature) water cans sustain some amount of stretching. If some threshold is reached, cavitation occurs. This is one of the reason a too high pressure may be dangerous. The mechanical index of the ultrasound beam quantifies this danger, as it is expressed in terms of the minimum pressure of the ultrasound peak.
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An acoustic wave is a traveling pressure disturbance .... An ultrasound image displays the magnitude (absolute value of amplitude) of ... A negative value of R implies that the reflected
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