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.22lr Ballistic tip ammo
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I always thought it was dependent on temperature rather than altitude...Well, looks like either my memory is fading or I miscalculated back in the day!
maybe both.
http://www.engineeringtoolbox.com/elevation-speed-sound-air-d_1534.html
mneh - that list is indicative but still oversimplistic if you want to be precise about things.
It's air density (or density of any medium for that matter) which primarily dictates the propagation speed (stiffness of the medium also has a proportional impact aswell, but that's pretty constant for gases).
In any case, as pressure is a function of both alititude and temperature, you're both correct.
..adding a further layer of convolution though - individual frequencies do not propagate at the same speed either so what you get in any case is an average for the audible frequency range.
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They are linked. The higher you are the colder it is, the lower the air pressure, the less resistance a bullet has.
strictly speaking that's the wrong way around (although I'm really just splitting hairs here
) but the reason it's colder is because the air pressure is lower.
Lower density -> greater intermolecular spacing -> greater specific heat capacity -> more heat absoption -> bbbbbrrrrrrr....
and in relation to the speed of sound, this actually reduces it (which I find a little counterintuitive but there ya go).0 -
As you done yourself substitute the comma with the word because.extremetaz wrote: »strictly speaking that's the wrong way around (although I'm really just splitting hairs here) ...........
"The higher you go, the colder it is because the air pressure is lower."
So it's right, just the grammar is poor. And yes, you are splitting hairs.
/Fecking pedantic Pats.
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/Fecking pedantic Pats..
:D
In my defense I've been stuck on some rather "technical" problems in work for the last few days - ya know the kind where it's tiny little changes that make the difference?..
...so my pedantry (although, ever present) is rather elevated even by my own standards at the moment. 0 -
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