如果我们的大气中氮气和氧气压力双翻倍?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 08 - 17 - t08:45:42z //www.hoelymoley.com/feeds/question/14701 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/14701 4 如果我们的大气中氮气和氧气压力双翻倍? 马修·阿姆斯特朗 //www.hoelymoley.com/users/13469 2018 - 07 - 28 - t03:02:38z 2018 - 08 - 03 - t12:45:41z < p > p =ρgh,大气的高度会影响增加氮气和氧气的质量或高度保持不变吗?谢谢! < / p > //www.hoelymoley.com/questions/14701/-/14716 # 14716 1 由基思·麦克回答如果氮气和氧气在大气压力双翻倍? 基思·麦克 //www.hoelymoley.com/users/6535 2018 - 07 - 29 - t04:22:20z 2018 - 08 - 02 - t23:53:23z < p >压力只是表面单位面积的重量氛围,是的。< / p > < p >密度随高度所以没有定义良好的“顶级”。假设恒定的温度(< a href = " https://en.wikipedia.org/wiki/Atmospheric_models Isothermal-barotropic_approximation_and_scale_height”rel = " nofollow noreferrer " > Isothermal-barotropic近似< / >)密度下降指数与高度。< / p > < p > < a href = " https://i.stack.imgur.com/iiVyj.png " rel = " nofollow noreferrer " > < img src = " https://i.stack.imgur.com/iiVyj.png " alt = "在这里输入图像描述" > < / > < / p > < p >如果是翻倍就相同部分的质量高于任何给定的高度(但更多的质量高于任何给定的高度)。< / p > //www.hoelymoley.com/questions/14701/-/14742 # 14742 1 杰弗里·J Weimer回答的如果氮气和氧气在大气压力双翻倍? 杰弗里·J魏玛 //www.hoelymoley.com/users/13534 2018 - 08 - 01 - t14:47:29z 2018 - 08 - 02 - t18:53:02z < p >开始的问题是措辞如此……< / p > < p > p = \ρgh美元,大气的高度会影响增加氮气和氧气的质量或高度保持不变吗?谢谢! < / p >

Density is mass per volume.

You can only add mass to a system in one of two ways. One way is to keep density constant. In this case, volume must increase. Since volume is area times height, either area or height must increase. On the earth, the air on the surface cannot expand itself laterally. Area is constant. Therefore, we learn

—> ANSWER 1: As mass is added to air on the earth under the condition of constant density, the height of the air above the earth will increase.

Another way to add mass is to allow density to change. The intuitive first response is that, when we add mass, we expect density will increase. At the limit, this is the same as keeping volume constant. For this case, we learn

—> ANSWER 2: As mass is added to the air on the earth under the condition where density increases, the limiting case is one where the height of the air above the earth will not change.

Finally, we could argue that we want to allow volume to expand somewhat as mass is added. The result is an answer between the two above.

Note that air is compressible. Its density will change as a function of pressure and temperature. By the ideal gas law, $\rho = M n / V = M p / R T$ where molar mass, moles, volume, pressure, gas law constant, and temperature are used. The overall effect is that density is not a constant for the system of air above the earth.

Any other answer requires that we have clearer specifications of the system. We correspondingly learn, either the equation quoted is of no consequence to the question or the question is not phrased properly in respect to the equation quoted.

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