空中有东西
最新答案：2007年10月22日
问：
先生，除了氮和氧气外，我们呼吸了什么？是否可以进行实验来显示我们的空气是什么？
-Alysse（16岁）
澳大利亚的科夫斯港高地
-Alysse（16岁）
澳大利亚的科夫斯港高地
A：
空气大多是（78％左右）的氮，其余的大部分是氧气，因此您的大部分空气已经计算了。空气中有很多其他东西，浓度较低。有二氧化碳，水蒸气，氩气和霓虹灯。植物需要二氧化碳的新陈代谢。氩气和霓虹灯是化学惰性的，非常近似。
In addition to the usual constituents of air, just about anything that is in equilibrium with its vapor (or is a vapor) at standard temperatures and pressures can be found in air at some places and times, or perhaps everywhere if you’re willing to look hard enough. Methane is produced by bacteria decomposing biological material -- it’s often called "swamp gas". Alcohols and hydrocarbons evaporate and can be found in the atmosphere. Manmade and natural pollutants include oxides of nitrogen and sulfur. These latter can combine with water and form nitric and sulfuric acid, which poison lakes (an effect called "acid rain"). Carbon monoxide is a common pollutant produced by burning fuels. Particulates are little bits of stuff that are suspended in the air -- that is, they float and blow around until they settle on the ground. Black, sooty smoke from burning coal, for instance, looks the way it does because of all the little particulates in it. Ozone is also a common pollutant found in urban areas. Aerosol sprays used to use fluourocarbons which have now been banned, but they persist at a low level in the atmosphere. Walk by a kitchen when dinner’s cooking and you’ll be treated to a vast array of interesting molecules that smell good but are present in the air at low concentrations, and usually only at dinnertime.
可以通过标准的实验集检测氧和氮。有氧气时易燃的东西会燃烧，并且当所有氧气都用完时不会。可以通过缓慢冷冻空气并看到出来的东西来找到其余的东西。
水蒸气首先冷冻，留下普通的霜（或者您可以将其凝结为液体，形成露水）。二氧化碳在较冷的温度下冻结，但仍比氧或氮温暖得多，并且在普通压力下作为固体稳定。当氧气液化时，温度就在液氮温度上。液体氧气，就像其气体一样，也有助于燃烧燃烧，并且可能会危险。它也是顺磁性的，因此您可以在（冷！）磁铁的两极之间固定一些。
您可以用鼻子（有时）发现的其他东西，但是有许多有害气体会毒害您，但也没有任何气味或颜色，因此不要嗅探未知气体作为科学实验。各种气体探测器和“嗅探器”可用于检测空气和污染物特定成分的浓度。氧气仪很普遍，烟雾检查站将使探测器在汽车的尾管中，以检测其发射的各种污染物。
汤姆
In addition to the usual constituents of air, just about anything that is in equilibrium with its vapor (or is a vapor) at standard temperatures and pressures can be found in air at some places and times, or perhaps everywhere if you’re willing to look hard enough. Methane is produced by bacteria decomposing biological material -- it’s often called "swamp gas". Alcohols and hydrocarbons evaporate and can be found in the atmosphere. Manmade and natural pollutants include oxides of nitrogen and sulfur. These latter can combine with water and form nitric and sulfuric acid, which poison lakes (an effect called "acid rain"). Carbon monoxide is a common pollutant produced by burning fuels. Particulates are little bits of stuff that are suspended in the air -- that is, they float and blow around until they settle on the ground. Black, sooty smoke from burning coal, for instance, looks the way it does because of all the little particulates in it. Ozone is also a common pollutant found in urban areas. Aerosol sprays used to use fluourocarbons which have now been banned, but they persist at a low level in the atmosphere. Walk by a kitchen when dinner’s cooking and you’ll be treated to a vast array of interesting molecules that smell good but are present in the air at low concentrations, and usually only at dinnertime.
可以通过标准的实验集检测氧和氮。有氧气时易燃的东西会燃烧，并且当所有氧气都用完时不会。可以通过缓慢冷冻空气并看到出来的东西来找到其余的东西。
水蒸气首先冷冻，留下普通的霜（或者您可以将其凝结为液体，形成露水）。二氧化碳在较冷的温度下冻结，但仍比氧或氮温暖得多，并且在普通压力下作为固体稳定。当氧气液化时，温度就在液氮温度上。液体氧气，就像其气体一样，也有助于燃烧燃烧，并且可能会危险。它也是顺磁性的，因此您可以在（冷！）磁铁的两极之间固定一些。
您可以用鼻子（有时）发现的其他东西，但是有许多有害气体会毒害您，但也没有任何气味或颜色，因此不要嗅探未知气体作为科学实验。各种气体探测器和“嗅探器”可用于检测空气和污染物特定成分的浓度。氧气仪很普遍，烟雾检查站将使探测器在汽车的尾管中，以检测其发射的各种污染物。
汤姆
（发表于2007年10月22日）