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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistics Question?
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<blockquote data-quote="britz" data-source="post: 203260" data-attributes="member: 7865"><p>GG, according to JBM calc, the speed of sound is the same at both altitudes and 70 degrees. To be honest, at first I found that hard to believe, but upon reflection, the only difference in altitudes would be the force of gravity causing compression on the molocules (very very little difference). The biggest change (for the elevation that you mentioned) is going to be temp which affects the distance between molocules which has a direct affect on the time it takes for vibrations to travel from one molocule to another. Air has very little mass, so gravity will play a smaller role as long as we are talking only a few thousand feet. </p><p></p><p>Thats a good question though, 14.7 PSI is standard atmosphere at sea level and it takes how many feet of air to create that much pressure??? how high is the atmosphere anyway??? So actually the higher we go, the slower the speed of sound would be because as the air gets thinner it will be less "packed down". Sound doesn't travel at zero gravity so basically the higher we get, the lower the speed of sound will be with all other factos being equal.</p><p></p><p>OR AT LEAST I THINK <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> This one's kinda like the saturday night live skit "deep thoughts"</p></blockquote><p></p>
[QUOTE="britz, post: 203260, member: 7865"] GG, according to JBM calc, the speed of sound is the same at both altitudes and 70 degrees. To be honest, at first I found that hard to believe, but upon reflection, the only difference in altitudes would be the force of gravity causing compression on the molocules (very very little difference). The biggest change (for the elevation that you mentioned) is going to be temp which affects the distance between molocules which has a direct affect on the time it takes for vibrations to travel from one molocule to another. Air has very little mass, so gravity will play a smaller role as long as we are talking only a few thousand feet. Thats a good question though, 14.7 PSI is standard atmosphere at sea level and it takes how many feet of air to create that much pressure??? how high is the atmosphere anyway??? So actually the higher we go, the slower the speed of sound would be because as the air gets thinner it will be less "packed down". Sound doesn't travel at zero gravity so basically the higher we get, the lower the speed of sound will be with all other factos being equal. OR AT LEAST I THINK ;) This one's kinda like the saturday night live skit "deep thoughts" [/QUOTE]
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Ballistics Question?
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