please help me some information on air molcules
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The hotter air is, the faster the molecules are air move around, bashing into things.  That mass of moving molecules is what keeps a balloon inflated-its literally uncountable trillions of tiny molecules acting like tennis balls banging around.  Increase the heat, and those molecules go faster, and hit the surfaces harder. They also spread out more, which is why hor air is lighter than cold air...less density of molecules. You put a fire in a bottle, and the air molecules move faster, and get more dispersed.  It fills the balloon, because of this expansion of the air.  As it cools down, the molecules collapse in closer together and move more slowly, and thus the balloon collapses.
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http://www.hotairballons.com/
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Check the link below (sorry Yahoo doesn't like long links so joint the 2 together)\n\nGet training if you aren't already experienced or u are goign to bounce ... its not as easy as it looks .\n\nBlue skies
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http://search.yahoo.com/search?p=airborne+electromagnetic+study&fr=FP-tab-web-t362&toggle=1&cop=&ei=UTF-8
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http://www.mova.com.ua/book/0/42290.html\nhttp://www.ozon.ru/context/detail/id/937065/?partner=ljh4t5rt\nhttp://www.tsengel.com/forums/index.php?showtopic=171\nhttp://referats.allbest.ru/languages/1192472.html
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http://www.creditcardguide.com/airmiles.html
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http://www.alpieagles.com/\n\nlooks like someone booked a flight
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look up bernoulis theorum...this will tell you all you need to know reference changes in pressure with respect to aeronatical engineering.\n\nGood Luck
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You could make a cloud chamber. It's a chamber that's saturated with alcohol vapor so when a cosmic ray or radioactive particle enters the chamber it leaves a trail of mist like when a plane leaves a vapor trail. It does use dry ice and isopropyl alcohol though. It's kind of complicated but would be worth it in the end.
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http://www.chemweek.com/inc/articles/s/1995/12/06/CW1995-12-06_2658.html\n\nhttp://www.csm.pemex.com/english/press/releases/12.html\n\nhttp://www.sap.com/solutions/business-suite/srm/pdf/CCS_Pemex_Gas.pdf
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aero zepplin or something like that
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Check this out..\nThe primary air mass classifications are given below:\n\nmT= Maritime Tropical\nmP= Maritime Polar\ncP = Continental Polar\ncT = Continental Tropical\nA = Arctic\nH = Highland\n\nMaritime Tropical\n\nThe maritime tropical air mass is most often felt in the Southeast US. In the winter this air mass is shoved toward the equator but in summer it can cover much of the US east of the Rockies. This air mass results from the warm waters of the Gulf of Mexico and Gulf Stream. The warm waters in this region evaporate an enormous volume of water. Cold water currents tend to stabilize the atmosphere and produce little evaporation while warm waters destabilize the atmosphere and add moisture. The warm waters warm the low levels of the atmosphere. Temperatures in this air mass warm to highs in the 80's and 90's in the summer and the 70's and 80's in winter. High dewpoints characterize mT air. At all times of the year dewpoints are greater than 50 ° F. The majority of US thunderstorm activity develops within the mT airmass, most being by way of scattered thermodynamic thunderstorms and thunderstorms out ahead of fronts.\nAs the maritime tropical airmass moves over land it begins to "pick up" characteristics of a continental climate. This is particularly true when the mT airmass moves toward the North. The mT airmass modifies due to lower sun angles, drier land below, and cooler land below. The surface CHART #1 show a mT airmass across the Eastern US with the classic mT airmass in the Southeast US and a modified mT airmass across New England. (link to this chart is coming soon)\n\nMaritime Polar\n\nThe source region for mP air is over cold ocean currents or high latitude ocean waters. This air does not have the moisture content as mT air. Since mP air is always near saturation, orographic lifting of the air mass can produce widespread rain or snow. This air mass is notorious for producing fog, drizzle, cloudy weather and long lasting light to moderate rain. The temperature of mP air ranges from just above freezing to below 70 ° F. mP air is modified as it moves over elevated terrain. On the windward side of mountain ranges, mP air can produce an abundance of rain and snow. Once on the lee side of mountains, the mP airmass modifies into a continental airmass. These air masses produce cold fronts but the air is not as cold as polar or arctic fronts. They are often termed "Pacific fronts" or "back-door cold fronts". Maritime Polar air occurs frequently in the Pacific Northwest and to a lesser degree New England and can be seen on CHART #1.\n\nContinental Polar\n\nThis airmass has low dewpoints, cold temperatures and a high degree of stability. The denseness of cP air creates surface high pressure and a trough aloft, especially when cP air moves into lower latitudes. Precipitation in association with cP air is usually light due to the dryness and low moisture capacity of the air. Precipitation is most common on the "edges" of cP air, especially where it intersects and displaces mT air. Precipitation within a cP air mass is elevated and dynamically induced. These dynamical uplift mechanisms include jet streaks, isentropic lifting and positive differential vorticity advection. Cold surface temperatures and a dry boundary layer inhibit thermodynamic convection.\ncP air modifies rapidly as it moves to the South. The dewpoints remain low but the temperature of this airmass increases when moving South due to the following: warmer soil temperature, a shallower airmass, higher sun angles and a lack of surface snow cover. cP air will modify less rapidly if soil temperature are abnormally low to the south (especially if surface snow cover exists). On some occasions the subtropical jet will "overrun" the shallow cP air. If this occurs, the cP air will modify less rapidly due to a much reduced solar heating. Once cP air modifies significantly it no longer makes sense to la
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There are various sites that explain how to build a paper blimp, just scale them up, as far as material goes you need an airtight flexible material that isnt subject to uv attack, mylar is the favorite.
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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..
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try this:\nhttp://eny3005.ifas.ufl.edu/lab1/
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Hope the sites below will help
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1) The oxygen in the outside air enters the rodent's body through the twin nostrils.\n\n2) From there it enters the trachea through glottis.\n\n3) From the trachea or the wind pipe it goes to its twin branches called bronchi .\n\n4) From each bronchus it enters one of the twin lungs.\n\n5) The tiniest part of the lung is called alveolus (plural is alveoli). It is like an inflated balloon. The air in side this balloon is the fresh air  inhaled.\n Now imagine your ten fingers covering an inflated balloon from all the sides. That is how the blood capillaries cover the alveoli. These blood capillaries have extremely thin wall through the oxygen, which is at a higher concentration in the fresh air of the alveoli, diffuses in the blood capillary. It is immediately picked up by the hemoglobin in the Red blood cells forming oxyhemoglobin. It is the source of oxygen to the body. This is then taken to different parts of the body and given to them.\nAt the same time, CO2 collected from the body parts and brought to the alveoli by those vary capillaries diffuses in to the air of the alveoli because its concentration in the capillaries is greater. \nThe air in the alveoli is now stale air rich in CO2 and poor in O2. It is exhaled out.\nThus, the gaseous exchange can occur only on the surface of the alveoli. Their walls are as thin as the walls of a soap bubble, only that they are not fragile like soap bubble.