What makes up air, what what are the proportions?
821107
The below make up 99.998% of air\n\nNitrogen N2 78.084% \nOxygen O2 20.947% \nArgon Ar 0.934% \nCarbon Dioxide CO2 0.033% \n\nThe remaining percentage of air is made up of:\n\nNeon Ne 18.2 parts per million \nHelium He 5.2 parts per million \nKrypton Kr 1.1 parts per million \nSulfur dioxide SO2 1.0 parts per million \nMethane CH4 2.0 parts per million \nHydrogen H2 0.5 parts per million \nNitrous Oxide N2O 0.5 parts per million \nXenon Xe 0.09 parts per million \nOzone O3 0.07 parts per million \nNitrogen dioxide NO2 0.02 parts per million \nIodine I2 0.01 parts per million \nCarbon monoxide CO trace \nAmmonia NH3 trace
355368
Process used in mixing air into a compound to separate minerals.\n\nCheck out the following link:
785888
It all depends on the exact composition of air. Air is a mixture of gasses, Nitrogen, Oxygen, Carbon Dioxide, Carbon monoxide and small amounts of various other gasses. Freezing occurs when the gaseous mixture turns from a liquid and then into a solid. Although it may theoretically be possible to solidify Air, it has not actually been reached.
780378
vapor\n\ngas\n\nliquid\n\nvapor\n\nliquid\n\n\nnot 100% sure but i'm pretty good at science
697479
Mostly hydrogen. There is a little bit of helium and heavier elements in there as well.
872661
If nitrogen makes up 78% of the air, it will be responsible for 78% of the pressure, namely 760(0.78) = 592.8 mm Hg.
1045178
Wikipedia of course\nhttp://en.wikipedia.org/wiki/Air
780338
Oxygen = O\nNitrogen = N\nCarbon Dioxide = CO2\n\nThey take up the space that is allowed them by the gravity and temperature of the planet, but oxygen and nitrogen form the main two constituents of the atmosphere.
1103330
My thought is air as well. Air is composed of around 2/3s part of Nitrogen. Oxygen is a much smaller amount
187568
You can come up with a molecular weight of air - use the percentages of the different molecules comprising air and the molecular weight of the components.  The answer is around 29 g/mol (I think).
899296
We don't breathe oxygen...we breathe a mixture of mostly nitrogen.\n\nThe air we breathe is made up of significant quantities of four gases:\n\n   1. Nitrogen (78%)\n   2. Oxygen (21%)\n   3. Argon (0.94%)\n   4. Carbon dioxide (0.04%) \n\nWhen we breathe in air, our bodies consume its oxygen and convert it to carbon dioxide. Exhaled air contains about 4.5-percent carbon dioxide. Our bodies do not do anything with nitrogen or argon.
531056
We have air in abundance it surrounds the earth , it's a mixture of Oxygen and Nitrogen etc.\nWhy do you want to make more??
408414
The easy answer is, of course, from the potato salad and burrito you had earlier. A more dignified answer is at Scientific American. \n\nSimply put, wind is the motion of air molecules. Two concepts are central to understanding what causes wind: air and air pressure. Air comprises molecules of nitrogen (about 78 percent by volume), oxygen (about 21 percent by volume), water vapor (between 1 and 4 percent by volume near the surface of the earth) and other trace elements. Every time we breathe, the air we inhale is composed of about the same relative ratios of these molecules, and a cubic inch of air at ground level contains about 1020 molecules. \n\nAll of these air molecules are moving about very quickly, colliding readily with each other and any objects at ground level. Air pressure is defined as the amount of force that these molecules impart on a given area. In general, the more air molecules present, the greater the air pressure. Wind, in turn, is driven by what is called the pressure gradient force. Changes in air pressure over a specified horizontal distance cause air molecules from the region of relatively high air pressure to rush toward the area of low pressure. Such horizontal pressure differences of all scales generate the wind we experience. \n\nThe areas of high and low pressure displayed on a weather map in large part drive the (usually) gentle ambient wind flow we experience on a given day. The pressure differences behind this wind are only about 1 percent of the total atmospheric pressure, and these changes occur over the range of multiple states. The winds in severe storms, in contrast, are a result of much larger and more concentrated areas of horizontal pressure change. Tornadoes are great examples. In June 2003 Tim Samaras of Applied Research Associates placed a scientific probe in the direct path of an F4 (devastating) tornado near Manchester, S. Dak. He found that the air pressure dropped by 10 percent of the total atmospheric value over the radius of the tornado. The magnitude of this air pressure change, and the very short distance over which it occurred, explains why the winds are so destructive in this phenomenon: air molecules are very quickly accelerated into the very low pressure at the center of the tornado where the water vapor contained in the air often condenses, creating the often visible "condensation funnel."
1144696
gravity and air resistance.
742236
The atmosphere is 21% oxygen.  The process of separating the gases from each other is where the expense is.  They compress the gas and the cool it until it turns into a liquid.  Different gasses turn into a liquid at different temperatures.  Then they bottle it and ship it.
573247
Answer to all your Questions.. \n1....The atmosphere contains\nØnitrogen –78% (molecular mass –28)\nØoxygen – 21% (molecular mass – 32)\nØArgon – 0.9% (molecular mass – 40 )\n\nSo the average  molecular mass of air\n=    (78*28 + 21*32 + 40*.9) / 99.9\n=  28.95 approximately\nSo any gas having molecular mass (= 2*vapour density)> 28.95\nwill be heavier tha air . eg. CO2(molecular mass=44),       O2(m.m.=32) etc.\n\n2...Some element which is liquid at room temprature :\nBromine (Group 17 non metal)\nMercury (group 12 metal)\nGallium (Group 13 metal)\nFrancium (Group 1 metal)\n3..Transition Metals Exploited by Man\nIron ,Fe(symbol)\nZinc ,Zn (not considered as true transition metal as its 3d and molecular mass 4s orbitals are filled)\nCopper ,Cu\nSilver ,Ag\nGold ,Au\nMnagenese ,Mn\nThese are some comman tanstition elements exploited \nby man. \nIf you want more then search for them in\n www.google.co.in in search in India  mode as these topics are  taught\nin India.\nU can search for it elsewhere too...\n4.. TRANS – URANIUM METALS \nThese metals are all synthetic i.e. made by man as they don't occur in nature\nThey all have Atomic Number greater than 92 (i.e. from 93 to 118 )\nSome Examples For U are:\nØneptunium Np(symbol)(atomic number –93)\nØPlutonium Pu(a.n. –94)\nØAmericium Am(a.n. 95)\nØLawrencium Lr (a.n.103) , etc...\n\n\nU can search for the pictures on net ,and  I have suggested U only one URL ,but don't hang on it.\nOne more site : www.thomson.com (see If You can find there)\nI am Shishir from India..
931550
adjust the ratio of gas that mixes with air for combustion