g*d
2 楼
为什么取之不尽用之不绝
i*e
3 楼
这个问题要检查出来还是比较容易的。
如果有点动手能力的话，我可以一步一步地教你检查下去，需要准备个电流测试表。
把机子的型号贴上来。
如果有点动手能力的话，我可以一步一步地教你检查下去，需要准备个电流测试表。
把机子的型号贴上来。
H*7
4 楼
地球内部核聚变产生火山活动，火山喷发释放氨气和CO2。CO2产生氧气。氨气和氧气产
生氮气。氨气是不活跃气体，所以慢慢积累
生氮气。氨气是不活跃气体，所以慢慢积累
t*u
5 楼
竟无言以对
[发表自未名空间手机版 - m.mitbbs.com]
【在 H******7 的大作中提到】
: 地球内部核聚变产生火山活动，火山喷发释放氨气和CO2。CO2产生氧气。氨气和氧气产
: 生氮气。氨气是不活跃气体，所以慢慢积累
[发表自未名空间手机版 - m.mitbbs.com]
【在 H******7 的大作中提到】
: 地球内部核聚变产生火山活动，火山喷发释放氨气和CO2。CO2产生氧气。氨气和氧气产
: 生氮气。氨气是不活跃气体，所以慢慢积累
n*4
6 楼
在恒星内部炼成，超新星爆炸后散到周围，第二代星系形成时聚集到行星上
【在 g********d 的大作中提到】
: 为什么取之不尽用之不绝
【在 g********d 的大作中提到】
: 为什么取之不尽用之不绝
D*s
7 楼
牛等大型动物多，不停放屁，屁中有氨气，空气中发生氧化还原反应变成了氮气就积累
起来了。以后要开征放屁税
【在 g********d 的大作中提到】
: 为什么取之不尽用之不绝
起来了。以后要开征放屁税
【在 g********d 的大作中提到】
: 为什么取之不尽用之不绝
K*2
8 楼
氨气氧化不是搞出氮氧化物么，温室气体
【在 D***s 的大作中提到】
: 牛等大型动物多，不停放屁，屁中有氨气，空气中发生氧化还原反应变成了氮气就积累
: 起来了。以后要开征放屁税
【在 D***s 的大作中提到】
: 牛等大型动物多，不停放屁，屁中有氨气，空气中发生氧化还原反应变成了氮气就积累
: 起来了。以后要开征放屁税
n*d
9 楼
盐气都溶解在海水里了，就剩下了氮气
【在 g********d 的大作中提到】
: 为什么取之不尽用之不绝
【在 g********d 的大作中提到】
: 为什么取之不尽用之不绝
g*d
10 楼
擦 第一句就错了
【在 H******7 的大作中提到】
: 地球内部核聚变产生火山活动，火山喷发释放氨气和CO2。CO2产生氧气。氨气和氧气产
: 生氮气。氨气是不活跃气体，所以慢慢积累
【在 H******7 的大作中提到】
: 地球内部核聚变产生火山活动，火山喷发释放氨气和CO2。CO2产生氧气。氨气和氧气产
: 生氮气。氨气是不活跃气体，所以慢慢积累
m*d
11 楼
氮气真么多，生物为什么不呼吸氮气？
t*u
12 楼
学术版的素质怎么会降低这么多
【在 m**d 的大作中提到】
: 氮气真么多，生物为什么不呼吸氮气？
【在 m**d 的大作中提到】
: 氮气真么多，生物为什么不呼吸氮气？
l*o
13 楼
别太认真，只要想想脚地下每天不停的核聚变，顿时觉得人生瞬间高大上了不少。
【在 g********d 的大作中提到】
: 擦 第一句就错了
【在 g********d 的大作中提到】
: 擦 第一句就错了
r*9
14 楼
same here
【在 D***s 的大作中提到】
: 牛等大型动物多，不停放屁，屁中有氨气，空气中发生氧化还原反应变成了氮气就积累
: 起来了。以后要开征放屁税
【在 D***s 的大作中提到】
: 牛等大型动物多，不停放屁，屁中有氨气，空气中发生氧化还原反应变成了氮气就积累
: 起来了。以后要开征放屁税
H*g
15 楼
听说氮气可以杀死人，太可怕了。
【在 D***s 的大作中提到】
: 牛等大型动物多，不停放屁，屁中有氨气，空气中发生氧化还原反应变成了氮气就积累
: 起来了。以后要开征放屁税
【在 D***s 的大作中提到】
: 牛等大型动物多，不停放屁，屁中有氨气，空气中发生氧化还原反应变成了氮气就积累
: 起来了。以后要开征放屁税
u*q
16 楼
人呼气大部分都是氮气，所以一直用不完。
T*U
17 楼
蛋白质分解？当然蛋白质一开始也是氮气来的？
【在 g********d 的大作中提到】
: 为什么取之不尽用之不绝
【在 g********d 的大作中提到】
: 为什么取之不尽用之不绝
H*g
18 楼
因为氮气和氮的很多化合物都容易以气态逃逸，地球上的氮气含量比宇宙平均值低。
Nitrogen is a common element in the universe, and is estimated to be
approximately the seventh most abundant chemical element by mass in the
universe, the Milky Way, and the Solar System. In these places it was
originally created by fusion processes from carbon and hydrogen in
supernovas.[31] Molecular nitrogen and nitrogen compounds have been detected
in interstellar space by astronomers using the Far Ultraviolet
Spectroscopic Explorer.[32]
Due to the volatility of elemental nitrogen and also its common compounds
with hydrogen and oxygen, nitrogen and its compounds were driven out of the
planetesimals in the early Solar System by the heat of the Sun, and in the
form of gases, were lost to the rocky planets of the inner Solar System.
Nitrogen is therefore a relatively rare element on these inner planets,
including Earth, as a whole. In this, nitrogen resembles neon, which has a
similar high abundance in the universe, but is also rare in the inner Solar
System. Nitrogen is estimated at 30th of the elements in crustal abundance.
There exist some relatively uncommon nitrogen minerals, such as saltpeter (
potassium nitrate), Chile saltpeter (sodium nitrate) and sal ammoniac (
ammonium chloride). Even these are known mainly as concentrated from
evaporative ocean beds, due to their ready solubility of most naturally-
occurring nitrogen compounds in water. A similar pattern occurs with the
water solubility of the uncommon light element boron.[citation needed]
Nitrogen is a common element in the universe, and is estimated to be
approximately the seventh most abundant chemical element by mass in the
universe, the Milky Way, and the Solar System. In these places it was
originally created by fusion processes from carbon and hydrogen in
supernovas.[31] Molecular nitrogen and nitrogen compounds have been detected
in interstellar space by astronomers using the Far Ultraviolet
Spectroscopic Explorer.[32]
Due to the volatility of elemental nitrogen and also its common compounds
with hydrogen and oxygen, nitrogen and its compounds were driven out of the
planetesimals in the early Solar System by the heat of the Sun, and in the
form of gases, were lost to the rocky planets of the inner Solar System.
Nitrogen is therefore a relatively rare element on these inner planets,
including Earth, as a whole. In this, nitrogen resembles neon, which has a
similar high abundance in the universe, but is also rare in the inner Solar
System. Nitrogen is estimated at 30th of the elements in crustal abundance.
There exist some relatively uncommon nitrogen minerals, such as saltpeter (
potassium nitrate), Chile saltpeter (sodium nitrate) and sal ammoniac (
ammonium chloride). Even these are known mainly as concentrated from
evaporative ocean beds, due to their ready solubility of most naturally-
occurring nitrogen compounds in water. A similar pattern occurs with the
water solubility of the uncommon light element boron.[citation needed]
H*g
21 楼
https://www.soest.hawaii.edu/GG/ASK/atmo-nitrogen.html
简单回答为什么大气里最多：
Reply to ASK-AN-EARTH-SCIENTIST
Subject: Abundance of Nitrogen in Earth's Atmosphere
Why is nitrogen the most common element in the earths atmosphere?
The answer lies mostly in three facts:
1. nitrogen is volatile in most of its forms
2. it is unreactive with materials that make up the solid earth
3. it is very stable in the presence of solar radiation.
To understand the abundance of N in the atmosphere, it is useful to
compare it to O (the next most abundant element in the atmosphere). Compared
to O, N is 4 times as abundant in the atmosphere. However, we must also
consider the relative abundances of O and N over the entire Earth (oxygen is
about 10,000 times more abundant). These earthly abundances overall reflect
the composition of the material from which the Earth originally formed and
the process of Earth's accretion. Oxygen is a major component of the solid
earth, along with Si and elements such as Mg, Ca and Na. Nitrogen is not
stable as a part of a crystal lattice, so it is not incorporated into the
solid Earth. This is one reason why nitrogen is so enriched in the
atmosphere relative to oxygen. The other primary reason is that, unlike
oxygen, nitrogen is very stable in the atmosphere and is not involved to a
great extent in chemical reactions that occur there. Thus, over geological
time, it has built up in the atmosphere to a much greater extent than oxygen
. It is important to know that both nitrogen and oxygen are intimately
involved with the cycle of life on the planet, but that chemicals cycle
through this material on a short time scale relative to the geological
processes that have, over time, made the earth what it is today (
compositionally and physically). N and O are found in the living biosphere
and fossil organic matter (and both are soluble in sea water too). But, only
a small fraction (less than 1% for N and much, much less than 1% for O) of
the total for these element on the planet are to be found in these places.
Dr. Ken Rubin, Assistant Professor
Department of Geology and Geophysics
University of Hawaii, Honolulu HI 96822
简单回答为什么大气里最多：
Reply to ASK-AN-EARTH-SCIENTIST
Subject: Abundance of Nitrogen in Earth's Atmosphere
Why is nitrogen the most common element in the earths atmosphere?
The answer lies mostly in three facts:
1. nitrogen is volatile in most of its forms
2. it is unreactive with materials that make up the solid earth
3. it is very stable in the presence of solar radiation.
To understand the abundance of N in the atmosphere, it is useful to
compare it to O (the next most abundant element in the atmosphere). Compared
to O, N is 4 times as abundant in the atmosphere. However, we must also
consider the relative abundances of O and N over the entire Earth (oxygen is
about 10,000 times more abundant). These earthly abundances overall reflect
the composition of the material from which the Earth originally formed and
the process of Earth's accretion. Oxygen is a major component of the solid
earth, along with Si and elements such as Mg, Ca and Na. Nitrogen is not
stable as a part of a crystal lattice, so it is not incorporated into the
solid Earth. This is one reason why nitrogen is so enriched in the
atmosphere relative to oxygen. The other primary reason is that, unlike
oxygen, nitrogen is very stable in the atmosphere and is not involved to a
great extent in chemical reactions that occur there. Thus, over geological
time, it has built up in the atmosphere to a much greater extent than oxygen
. It is important to know that both nitrogen and oxygen are intimately
involved with the cycle of life on the planet, but that chemicals cycle
through this material on a short time scale relative to the geological
processes that have, over time, made the earth what it is today (
compositionally and physically). N and O are found in the living biosphere
and fossil organic matter (and both are soluble in sea water too). But, only
a small fraction (less than 1% for N and much, much less than 1% for O) of
the total for these element on the planet are to be found in these places.
Dr. Ken Rubin, Assistant Professor
Department of Geology and Geophysics
University of Hawaii, Honolulu HI 96822
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