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#11
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"Ray Vingnutte" wrote in message ... On Fri, 24 Dec 2004 21:09:17 -0000 "OG" wrote: Maybe the two points started at different speeds? Nope sorry, In that case there is no increase in separation and nothing to explain Yes there is, the separation is observed and can be measured, the motion of the two points can be accounted for, except the separation, the only explanation on offer is that the void, the nothing, is expanding thus increasing the distance between the two points. This explanation smacks of desperation. A void, a nothing expanding??, oh please. I would still like to see an explanation of how this nothing is expanding. Maybe the nothing is not expanding but that new nothing is being created in the already existing nothing thus creating even more nothing that goes on to create even more nothing and so on and so on ;-) What ? ? ? You see an increasing separation WITHOUT a relative motion? |
#12
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On Fri, 24 Dec 2004 21:27:20 -0000
"OG" wrote: "Ray Vingnutte" wrote in message ... On Fri, 24 Dec 2004 21:09:17 -0000 "OG" wrote: Maybe the two points started at different speeds? Nope sorry, In that case there is no increase in separation and nothing to explain Yes there is, the separation is observed and can be measured, the motion of the two points can be accounted for, except the separation, the only explanation on offer is that the void, the nothing, is expanding thus increasing the distance between the two points. This explanation smacks of desperation. A void, a nothing expanding??, oh please. I would still like to see an explanation of how this nothing is expanding. Maybe the nothing is not expanding but that new nothing is being created in the already existing nothing thus creating even more nothing that goes on to create even more nothing and so on and so on ;-) What ? ? ? You see an increasing separation WITHOUT a relative motion? Yes of course, those distant galaxies are not really travelling at such high speeds away from other galaxies, the increased separation is not due to their relative motion away from each other. The current explanation is that the nothing in between is expanding. The only motion those distant galaxies have would be similar to our galaxies motion, the effect of localised forces acting on them which as I said in the other post local forces can be ignored. |
#13
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4th paragraph
"In fact, assuming a perfect gas the speed of sound depends on temperature only, not on the pressure" Fine, so temperature is part of the equation. But again you're missing the whole point of the analogy- which is, diminishing propagation speed correlates to diminishing density of the medium. You're perpetually fixated on details, minutiae and particulars, unable or unwilling to see in overview and whole concepts. This is why we have no basis for dialog(ue). But have a very merry Xmas. And easy on the punch.g |
#14
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#15
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Bill Sheppard wrote:
4th paragraph "In fact, assuming a perfect gas the speed of sound depends on temperature only, not on the pressure" Fine, so temperature is part of the equation. But again you're missing the whole point of the analogy- which is, diminishing propagation speed correlates to diminishing density of the medium. You're perpetually fixated on details, minutiae and particulars, unable or unwilling to see in overview and whole concepts. This is why we have no basis for dialog(ue). But have a very merry Xmas. And easy on the punch.g The point is that speed is NOT dependent on the density. Temperature is NOT density. There is NO dependence on density. How on earth can you read 'depends on temperature only, not on the pressure' and still assert that there is a correlation with the decreasing density. Have a look at the table on the same page - above 20,000 km, as the temperature of the atmosphere increases, the speed of sound actually increases. I hope you're not pretending that atmospheric density increases above 20Km! This is not fixating on minutiae, this is simply trying to get a description of how FScG is supposed to work. I ask how light speed depends on density and you say "its just like sound", but speed of sound does not depend on density. I'm stil trying to find what you mean. I'll leave it for now. Enjoy your Holiday - feel free to come back to this thread when you're ready. Owen |
#16
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OG wrote: "Bill Sheppard" wrote in message ... Is the speed of light increasing as space gets less dense, or is it slowing down? Does the speed of sound in air increase or decrease with diminishing density/pressure? Pretty much a no brainer. The speed of sound is independent of pressure at constant temperature. http://en.wikipedia.org/wiki/Speed_of_sound So are you saying there is NO dependence between the speed of light and the density of space? That is only an approximation. The speed of sound does decrease with lower pressure. See: http://www.newton.dep.anl.gov/askasc...0/phy00826.htm Double-A |
#17
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From Double A:
That is only an approximation. The speed of sound does decrease with lower pressure. See: http://www.newton.dep.anl.gov/askasci/p hy00/phy00826.ht Thanks AA. That nicely expresses the essence of the analogy without over-complication with endless fixation on details, minutiae and particulars. oc |
#18
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"Double-A" wrote in message oups.com... OG wrote: "Bill Sheppard" wrote in message ... Is the speed of light increasing as space gets less dense, or is it slowing down? Does the speed of sound in air increase or decrease with diminishing density/pressure? Pretty much a no brainer. The speed of sound is independent of pressure at constant temperature. http://en.wikipedia.org/wiki/Speed_of_sound So are you saying there is NO dependence between the speed of light and the density of space? That is only an approximation. The speed of sound does decrease with lower pressure. See: http://www.newton.dep.anl.gov/askasc...0/phy00826.htm Double-A A trap for the unwary - The speed depends of the ratio of pressure and density. At a constant temperature (isothermal) for an ideal gas (non dispersive), the ratio of pressure and density is constant. The only way to change the ratio is to change the temperature (or the gas). Since ANY change of temperature causes a speed change and a change of temperature IS NECESSARY for a speed change, but changing pressure or density only changes the speed if there is ALSO a temperature change; then it is reasonable to say that the speed of sound is independent of density. Merry Christmas. |
#19
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This is not fixating on minutiae, this is simply trying to get a description of how FScG is supposed to work. You'll never begin to 'get it' until you've learned to think and visualize in overview and whole concepts. This is not a criticism, but simply an observation that some folk are hardwired to think only in reductivist details-and-particulars terms, and 'big picture' thinking is alien and antithetical to them. Enjoy your Holiday - feel free to come back to this thread when you're ready. Likewise. |
#20
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"Bill Sheppard" wrote in message ... From Double A: That is only an approximation. The speed of sound does decrease with lower pressure. See: http://www.newton.dep.anl.gov/askasci/p hy00/phy00826.ht Thanks AA. That nicely expresses the essence of the analogy without over-complication with endless fixation on details, minutiae and particulars. oc Hi Bill, Does this mean that the speed of light is therefore proportional to the square root of the density of space? Is there a numerical relationship there? So that we can say that at half the age of the universe, when it was eight times denser than it is now, the speed of light was 2.83 times what it is nowadays. Is that right? |
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