Geddes on Waveguides
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Multi-Way Conventional loudspeakers with crossovers

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
dlr
diyAudio Member

Join Date: Mar 2005
Location: Canton, MA
Quote:
 Originally posted by MJL21193 Lets reiterate: Water can be slightly compressed, but it takes incredible force to do so. Sound waves do not have enough energy to do this. They do have enough energy to make the molecules move, as demonstrated above, this takes very little force.
You've said nothing that is not explained fully by the equations that define the velocity of sound in a liquid. That velocity is dependent in part on the compressibility. It does not matter how large or small that factor. It is not a question of a simplistic and faulty mental model that cannot be explained. Yours is simply a faulty mental model and your explanation of the physics is wrong.

Dave

 25th July 2008, 01:13 PM #2 MEH   diyAudio Member   Join Date: Feb 2007 And off topic. This is "Geddes on Waveguides"; please start another thread called "John on the Compressibility of Water" that we can more easily ignore.
MJL21193
Account disabled at member's request

Join Date: Mar 2007
Quote:
 Originally posted by dlr You've said nothing that is not explained fully by the equations that define the velocity of sound in a liquid. That velocity is dependent in part on the compressibility. It does not matter how large or small that factor. It is not a question of a simplistic and faulty mental model that cannot be explained. Yours is simply a faulty mental model and your explanation of the physics is wrong. Dave
Here goes:
Velocity of sound in a liquid is governed by density. At a given pressure, water is most dense at 0*C- it's melting point. Don't forget about temperature when you talk about density. Temperature will have an impact on density, as the temp goes up, the molecule move faster and the water expands. All the way up to 100*C where water will boil and change states to a gas. This is a 1600 times volume expansion from liquid to gaseous.
So, we go from nearly no molecular movement at 0*C to 1600 times that at 100*C and at not point along this change can you compress it, without changing temperature. Yes, I said you cannot compress steam without a temperature change, and as water is at higher density at a lower temperature, you need to make the temperature drop to increase density.
So, in order for your sound wave to compress water, it needs to lower it's temperature. This is easily accomplished at the bottom of the ocean, from the trillions of pounds of pressure the mass of water is exerting, but up here on the crust, under normal room temperatures, with the amount of energy available in a sound wave, this will not happen.

 25th July 2008, 02:05 PM #4 gedlee   diyAudio Member     Join Date: Dec 2004 Location: Novi, Michigan Please move this pointless discussion somewhere else. __________________ Earl Geddes Gedlee Website
 25th July 2008, 05:44 PM #5 y8s   diyAudio Member     Join Date: May 2006 I hear the oceans are going to rise because of global warming. that sounds like sea level compressibility.

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Holton Precision Audio         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 New To Site? Need Help?

All times are GMT. The time now is 05:48 PM.