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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Allen Mag test rifle finished.....
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<blockquote data-quote="Jon A" data-source="post: 76261" data-attributes="member: 319"><p><strong>Re: wc872 burn rate</strong></p><p></p><p>The ideal gas law has very little to do with this subject.</p><p></p><p>Nowhere in the law does it account for a solid undergoing a chemical reaction and changing phases. That reaction (burning) will take place at different temperatures for different elements regardless of how much gas is produced. This is where much of the heat of firing comes from--not simply a gas being compressed.</p><p></p><p>Even if you try and apply it after combustion is complete (and at this point you are already well beyond peak pressure) different powders can have a different number of moles of gas which is a variable you don't know unless you know the exact chemical composition of each powder.</p><p></p><p>So yes, it is completely possible for two different loads for a rifle with two different powders to reach the same peak chamber pressure at much different temperatures.</p><p></p><p>Stick your finger in a hydraulic press and you'll see it doesn't take temperature to create pressure. The ideal gas law doesn't apply to that either. No magic required.</p></blockquote><p></p>
[QUOTE="Jon A, post: 76261, member: 319"] [b]Re: wc872 burn rate[/b] The ideal gas law has very little to do with this subject. Nowhere in the law does it account for a solid undergoing a chemical reaction and changing phases. That reaction (burning) will take place at different temperatures for different elements regardless of how much gas is produced. This is where much of the heat of firing comes from--not simply a gas being compressed. Even if you try and apply it after combustion is complete (and at this point you are already well beyond peak pressure) different powders can have a different number of moles of gas which is a variable you don't know unless you know the exact chemical composition of each powder. So yes, it is completely possible for two different loads for a rifle with two different powders to reach the same peak chamber pressure at much different temperatures. Stick your finger in a hydraulic press and you'll see it doesn't take temperature to create pressure. The ideal gas law doesn't apply to that either. No magic required. [/QUOTE]
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7mm Allen Mag test rifle finished.....
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