7+Properties+and+Components+of+Air

= okay. just include the uses or description of each component of air = = = = = =Air: Properties & Components=

A. 3 Main Gases & Concentration of Each

 * 1) Nitrogen-**78:** Is used for light bulbs and explosives
 * 2) Oxygen-**21%:** Colorless, odorless and tasteless. It is used in respiration. It is also used in industries that use kilns
 * 3) Argon-**0.9%:** Part of the noble gases It is colorless, odorless and tasteless. It is used in gas filled light bulbs and radio tubes

B .Other Gases Found In Air

 * 1) Neon- A colorless gas in standard conditions. It turns reddish-orange glow when used in discharge tubes.
 * 2) Methane- colorless and odorless gas that is abundant in nature.
 * 3) Nitrous Oxide- more commonly known as laughing gas. It is also a major greenhouse gas and air pollutant.
 * 4) Krypton: It is colorless, odorless and fairly expensive. It is used in certain flash photography bulbs. It has only few uses because it is very expensive.
 * 5) Xenon: It is a noble gas. It is colorless, odorless and tasteless. It is used to produce intense extremely short flashes of light. That is why it is commonly used inside flash bulbs
 * 6) Hydrogen*- used to embrittle metals. Used to be used for blimps/hot air balloons.
 * 7) Helium*: A noble gas. It is colorless, odorless and tasteless. It is used as a cooling medium for nuclear reactors, and it is also used for helium balloons.
 * 8) Water Vapour+: It is the source of all forms of precipitation and a good absorber and emitter of infrared radiation
 * 9) Carbon Dioxide+: Besides for being important for photosynthesis, it is also a good absorber and emitter of infrared radiation
 * 10) Ozone+:An effective absorber or ultraviolet radiation from the sun
 * 11) Sulfur Dioxide+:It can come from from burning coal and is hazardous to human health.
 * 12) Nitrogen Dioxide+: NO 2 is a reddish-brown gas with a pungent and irritating odour.

(*-These gases become more abundant from a height of 90km+ through diffusion because these are lighter gases) (+-These gases are of variable concentration. This means the concentration of these gases can change. Theses gases are all in small concentration, but may be very important for maintaining life on the earth's surface. Ex. Water Vapour and Carbon Dioxide are good absorbers of radiation.)



A. can be compressed
1. The spaces between the molecules of air are very large.

B. can be expanded
1. When heat is applied, the molecules of air spread farther away from each other.

C. has density
1. At sea level, on a standard day, the density of air is around 1.229 kg/m3

D. has temperature
1. The temperature of air depends on the amount of heat applied or reduced from the air.

E. has pressure
1. Depending on the distance from the core of the earth, the air pressure changes.

- //M -// //(kg/kmol)// || Chemical Symbol |||| Boiling Point || http://www.engineeringtoolbox.com/air-composition-d_212.html
 * Gas |||| Ratio compared to Dry Air //(%)// || Molecular Mass
 * ^  || By volume || By weight ||^   ||^   || //(K)// || //(oC)// ||
 * Oxygen || 20.95 || 23.20 || 32.00 || O2 || 90.2 || -182.95 ||
 * Nitrogen || 78.09 || 75.47 || 28.02 || N2 || 77.4 || -195.79 ||
 * Carbon Dioxide || 0.03 || 0.046 || 44.01 || CO2 || 194.7 || -78.5 ||
 * Hydrogen || 0.00005 || ~ 0 || 2.02 || H2 || 20.3 || -252.87 ||
 * Argon || 0.933 || 1.28 || 39.94 || Ar || 84.2 || -186 ||
 * Neon || 0.0018 || 0.0012 || 20.18 || Ne || 27.2 || -246 ||
 * Helium || 0.0005 || 0.00007 || 4.00 || He || 4.2 || -269 ||
 * Krypton || 0.0001 || 0.0003 || 83.8 || Kr || 119.8 || -153.4 ||
 * Xenon || 9 10-6 || 0.00004 || 131.29 || Xe || 165.1 || -108.1 ||

quiz

1. What are the 2 main components of air? 2. Enumerate 3 properties of air and explain. 3. Enumerate 2 minor components of air and explain their common use. 4. True or False. The air pressure in the clouds is always the same with the air pressure in the ocean. 5. True or False. The density of air is not changing.