Each positive end has to line up with a negative end in a certain way. But they are compressible otherwise longitudinal sound waves wound not move through them. Compressibilty is basically an increase in density with pressure. You can see which liquids are more compressible and which are less. Cryogenic liquids on the other hand have a density that is not much different from the gas and have greater compressibility.
Any terms added to the calculation due to relativity are too small to have any major effect on the answer. Liquids and solids are harder to compress than a gas because the molecules are essentially touching each other in liquids and solids.
There is not much special about the compressibility of water, and it is easier to compress than many common materials. For analysis of liquid flow, the liquid is often assumed to be incompressible because the tiny amount of shear force it takes to make the liquid flow is almost nothing compared to what it takes to compress to a comparable strain.
One of the most incompressible real substance is rubber, even compared to metals like titanium and steel, rubber is harder to compress, but it has a Jell-O-like lack of shear stiffness. To make a liquid more compressible, fill it with bubbles. The point I was trying to make is that a medium needs to be compressible for compression longitudinal waves to propogate. Well, yes and no. If you add pressurized air, you can actually see the air bubbles going into this bottle.
This increases the pressure inside the bottle. This is a recommended pre-visit activity for a field trip to Science World. It is related to exhibits in the Eureka! Investigate the properties of liquids and gases. Why does the water from the bottle spray you when you pull the straw out? What did you observe during the experiment? What was different between the two bottles?
When you blow air into the bottle where does it go? S-waves can not travel through liquids , that includes the Earth's core.
Since compression is essential to sound propogation, how do phenomena such as whale calls and underwater speakers work? Well basically the incompressibility of the water is just an approximation. You can always compress the water molecules; in fact, let's show how the phenomenon of propagation happens. We know that compression of the molecules by giving them a potential energy, so if we make them vibrate this will create a difference of pressure.
The energy will be transferred to the other molecules, and thus the sound wave will propagate through the medium depending on the nature of the medium. If it is a gas the velocity of propagation will be less since the molecules are farther from each other than in liquids. The speed of sound in water will be much higher because the molecules now are closer together, so the transfer of the energy and vibration will be faster than in the air.
That's why when you drown your head into the water you can never localize a sound source. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. If water is incompressible, how can sound propagate underwater? Ask Question. Asked 2 years, 1 month ago.
Active 7 months ago. Viewed 12k times. Improve this question. Omnitragedy Omnitragedy 1 1 gold badge 4 4 silver badges 7 7 bronze badges. Easy to read chart and there's some math on So incompressibility is the wrong assumption for the given evidence. Show 5 more comments. Active Oldest Votes. Improve this answer. BioPhysicist BioPhysicist On the other hand, light doesn't travel so well underwater as it does on land.
This might account for more underwater creatures investing in echo location over sight when compared to land ones. Show 1 more comment. Dmitry Grigoryev Dmitry Grigoryev 4, 1 1 gold badge 14 14 silver badges 32 32 bronze badges. In somewhat less infinity-suspicious terms, the wavelength will be much larger than the size of the system you consider. But it doesn't matter much in practice, since long before you reach those, the simplified models we usually use like bulk modulus no longer work anyway.
Not much denser after that, you get a black hole, so the real limit is probably not much higher than that assuming the sound spreads due to electromagnetism, of course. Add a comment. Here is an example SSP at a location north of Hawaii: Propagation of sound in solids, such as rock, are subject to volumetric deformations compression and shear deformations shearing called pressure waves longitudinal waves and shear waves transverse waves , respectively.
Water is compressible. The propagation of sound is possible in gases, liquids and solids. Rob Rob 2, 1 1 gold badge 8 8 silver badges 28 28 bronze badges. BioPhysicist Use punctuation to separate your sentences. Also, please make sure to use full words nothing like "cuz" instead of "because".
0コメント