Give two reason to justify air is a gas at room temperature
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Because of STP - standard temperature and pressure. At the earth’s atmospheric pressure and typical ambient temperature oxygen, nitrogen, argon, and carbon dioxide all exist in gaseous form.
Air can be converted to liquid in cryogenic processes that operate at much colder temperatures and much higher pressures than STP. Liquid oxygen and liquid nitrogen have many scientific and industrial uses, so are fairly common. Liquid argon is not quite as common, but also has industrial applications.
The exception is carbon dioxide, which goes straight to a solid (dry ice) when cooled.
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Abhishek Yashodhara Shettigar, Mechanical engineer currently into Pollution control Mtech course
Answered Sep 2 2016 · Author has 143 answers and 99.3k answer views
What else it would be!!!
Air by the way i space filled with different types of gas usually 78% nitrogen (gas), 21% oxygen with 1% all types of gases such as CO2, CO, SOx, NOx etc…
The space above the earth's surface is where these gases are released by natural(plant & animal respiration), anthropogenic (man made) like pollution from automobiles , industries, coal power plant ,which will be emitting these gases like CO2 , CO, NOx, SOx etc… NOx is produced also during lightning strikes where atmospheric nitrogen (N2) reacts with oxygen under heat in space due to lightning.
The gases have the general rule that , it is lighter in density, that is it's weight per unit Volume is lower than liquid.
Take an eg. If u fill 2 balloons upto same volume and size with water in balloon 1 and normal air blown by mouth in balloon 2. Which is lighter , obiviously the Baloon 2 filled with air. This means the water is having large amount of molecules or atoms (which gives the weight or mass in general to any substance) compared to air there are few atoms or molecules which are bonded weakely contrary to liquid.This weight (kg) in 1 Cubic metre (1m^3) volume space gives it density. But solids are one with stronger bonds and large no of molecules , so u can find a density of 7800kg/m^3 for steel, 1000kg/m^3 for water and around 1kg/m^3 for atmospheric air(atmospheric b coz if you take some heavier gas specifically then it's density will change).
The point here is earth surface is solid, the one above it is empty space , due to the density of the air(combination of N,O, trace gases) is lesser than solids and liquid the gases usually escape to this empty space making it as air. If the temperature is higher these gases( air ) will get elevated or sideways travel which you get as wind due to the temperature difference between the air above sea water and land, which is called as wind or ocean currents(not electricity though it's a different topic).
Hope u did get it and I think this is wat u meant in questioning ….if not provide more details….
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Dan Broughton, Systems Engineer, aspiring Expert Generalist
Answered Sep 11 2016
Air is a gas because all of the elements and compounds that comprise “air” are gasses in the range of typical atmospheric temperatures.
Dry air (i.e. no humidity) is a mixture of 78% Nitrogen, 21% Oxygen, and the remaining 1% is Argon, Carbon Dioxide, and many other trace gases.
The following are the boiling points of the above mentioned elements and the sublimation point of the compound:
Nitrogen: -320.4°F/-195.8°COxygen: -297.3°F/-183°CArgon: -302.5°F/-185.8°CCarbon Dioxide: -109.3°F/-78.5°C (sublimation)
Compared to atmospheric temperatures, these are all incredibly low. So the result is that all of the parts of air are gasses.
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Greg Burns, Systems Engineer - Safety at Various Companies (2008-present)
Answered Feb 6 2017 · Author has 2.5k answers and 1.2m answer views
Air is a gas because the average kinetic energy of the air (its temperature) is sufficient to overcome any intermolecular forces that would hold it together as a liquid or a solid.

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I done this only for knowledge
Air can be converted to liquid in cryogenic processes that operate at much colder temperatures and much higher pressures than STP. Liquid oxygen and liquid nitrogen have many scientific and industrial uses, so are fairly common. Liquid argon is not quite as common, but also has industrial applications.
The exception is carbon dioxide, which goes straight to a solid (dry ice) when cooled.
531 Views · View Upvoters
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Abhishek Yashodhara Shettigar, Mechanical engineer currently into Pollution control Mtech course
Answered Sep 2 2016 · Author has 143 answers and 99.3k answer views
What else it would be!!!
Air by the way i space filled with different types of gas usually 78% nitrogen (gas), 21% oxygen with 1% all types of gases such as CO2, CO, SOx, NOx etc…
The space above the earth's surface is where these gases are released by natural(plant & animal respiration), anthropogenic (man made) like pollution from automobiles , industries, coal power plant ,which will be emitting these gases like CO2 , CO, NOx, SOx etc… NOx is produced also during lightning strikes where atmospheric nitrogen (N2) reacts with oxygen under heat in space due to lightning.
The gases have the general rule that , it is lighter in density, that is it's weight per unit Volume is lower than liquid.
Take an eg. If u fill 2 balloons upto same volume and size with water in balloon 1 and normal air blown by mouth in balloon 2. Which is lighter , obiviously the Baloon 2 filled with air. This means the water is having large amount of molecules or atoms (which gives the weight or mass in general to any substance) compared to air there are few atoms or molecules which are bonded weakely contrary to liquid.This weight (kg) in 1 Cubic metre (1m^3) volume space gives it density. But solids are one with stronger bonds and large no of molecules , so u can find a density of 7800kg/m^3 for steel, 1000kg/m^3 for water and around 1kg/m^3 for atmospheric air(atmospheric b coz if you take some heavier gas specifically then it's density will change).
The point here is earth surface is solid, the one above it is empty space , due to the density of the air(combination of N,O, trace gases) is lesser than solids and liquid the gases usually escape to this empty space making it as air. If the temperature is higher these gases( air ) will get elevated or sideways travel which you get as wind due to the temperature difference between the air above sea water and land, which is called as wind or ocean currents(not electricity though it's a different topic).
Hope u did get it and I think this is wat u meant in questioning ….if not provide more details….
328 Views
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Is this answer useful?

Dan Broughton, Systems Engineer, aspiring Expert Generalist
Answered Sep 11 2016
Air is a gas because all of the elements and compounds that comprise “air” are gasses in the range of typical atmospheric temperatures.
Dry air (i.e. no humidity) is a mixture of 78% Nitrogen, 21% Oxygen, and the remaining 1% is Argon, Carbon Dioxide, and many other trace gases.
The following are the boiling points of the above mentioned elements and the sublimation point of the compound:
Nitrogen: -320.4°F/-195.8°COxygen: -297.3°F/-183°CArgon: -302.5°F/-185.8°CCarbon Dioxide: -109.3°F/-78.5°C (sublimation)
Compared to atmospheric temperatures, these are all incredibly low. So the result is that all of the parts of air are gasses.
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Greg Burns, Systems Engineer - Safety at Various Companies (2008-present)
Answered Feb 6 2017 · Author has 2.5k answers and 1.2m answer views
Air is a gas because the average kinetic energy of the air (its temperature) is sufficient to overcome any intermolecular forces that would hold it together as a liquid or a solid.

224 Views · View Upvoters
Your feedback is private.
Is this answer useful?
I done this only for knowledge
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