♦ ADAPTATION –
• These crustaceans are often a dark-green color. They can be easily identified as it has one normal claw and one noticeably larger snapper claw. Its disproportionately large claw can be up to half its body size which makes it look like it’s wearing an overgrown boxing glove.
• claw is designed rather like a pistol with two parts: a “hammer” part, that moves backward into a right-angled position, and the other half of the claw is in a fixed closed position. When it releases the hammer part of the claw it snaps perfectly into position and makes its tooth-shaped plunger move into a niche in the other half of the claw
♦MECHANISM-
It was once believed that the sound was generated when the two claw surfaces hit each other. But research has since shown that this isn’t the case. The snapping action of the claw actually shoots out a jet of water at up to 60 miles an hour which generates a low pressure cavitation bubble that bursts with a loud snap. This phenomenon can be explained by Bernoulli’s principle, which states that for an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid’s potential energy. In simpler terms, when a liquid moves above a certain speed, the pressure within the liquid decreases. When this pressure drops, it allows tiny air bubbles in these fast-moving fluids to expand and if the pressure builds back up, the bubbles explode.collapsing cavitation bubble reaches temperatures of over 5500 degrees Celsius which is almost equal to suns surface
♦ cavitation-disturbance of liquid: the rapid formation and collapse of bubbles in a liquid, caused by the movement of something in the liquid such as a propeller, or by waves of high-frequency sound.
watch out for belows link to clarify the mechanism——-
♦ ADAPTATION –
• These crustaceans are often a dark-green color. They can be easily identified as it has one normal claw and one noticeably larger snapper claw. Its disproportionately large claw can be up to half its body size which makes it look like it’s wearing an overgrown boxing glove.
• claw is designed rather like a pistol with two parts: a “hammer” part, that moves backward into a right-angled position, and the other half of the claw is in a fixed closed position. When it releases the hammer part of the claw it snaps perfectly into position and makes its tooth-shaped plunger move into a niche in the other half of the claw
♦MECHANISM-
It was once believed that the sound was generated when the two claw surfaces hit each other. But research has since shown that this isn’t the case. The snapping action of the claw actually shoots out a jet of water at up to 60 miles an hour which generates a low pressure cavitation bubble that bursts with a loud snap. This phenomenon can be explained by Bernoulli’s principle, which states that for an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid’s potential energy. In simpler terms, when a liquid moves above a certain speed, the pressure within the liquid decreases. When this pressure drops, it allows tiny air bubbles in these fast-moving fluids to expand and if the pressure builds back up, the bubbles explode.collapsing cavitation bubble reaches temperatures of over 5500 degrees Celsius which is almost equal to suns surface
♦ cavitation-disturbance of liquid: the rapid formation and collapse of bubbles in a liquid, caused by the movement of something in the liquid such as a propeller, or by waves of high-frequency sound.
watch out for belows link to clarify the mechanism——-