Noun
air ((uncountable and countable; plural: airs)- The mixture of gases comprising the earth's atmosphere.
- One of the four basic elements.
- A feeling or sense.
- :...to give it an air of artistry and sophistication.
- A sense of poise, graciousness, or quality.
- :1815 "He is very plain, undoubtedly--remarkably plain:--but that is nothing compared with his entire want of gentility. I had no right to expect much, and I did not expect much; but I had no idea that he could be so very clownish, so totally without air. I had imagined him, I confess, a degree or two nearer gentility." ? Jane Austen, Emma, Volume I, Chapter 4.
Verb
- To bring (something) into contact with the air, so as to freshen or dry it.
- To discuss varying viewpoints on a given topic.
- :1917 Thus, in spite of all opposition, the rural and urban assemblies retained the germ of local government, and in spite of the dual control, as the result of which much of their influence was nullified, they did have a certain value in airing abuses and suggesting improvements. ? National Geographic, v.31, March 1917
- To broadcast, as with a television show.
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...The Earth's atmosphere is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night. Dry air contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. Read full entry
This entry is from Wikipedia,the leading user-contributed encyclopedia.It may not have been reviewed by professional editors(See full disclaimer)
- 1.Earth's atmosphere - Wikipedia, the free encyclopedia
- This mixture of gases is commonly known as air. ... This heating warms air masses, which makes them less dense so they rise.
- http://en.wikipedia.org/wiki/A
ir
- 2.Air (Band) - Wikipedia
- User-created biography and discography of French electronic group Air. Also includes a photo gallery and extensive links to other resources.
- http://en.wikipedia.org/wiki/A
ir_(band)
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Air???????????????
What is the weight of the air
?
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Air has mass, therefore, air has weight. Mass and weight are dependent solely on the amount of the substance being measured. The more of the substance, the more mass and the higher the weight. You did not specify an amount of air, just "the" air. Did you mean all of the air on Earth? Dry air has a density of 1.2 kg/m^3 at 20 degrees C and 1 atm of pressure. In order to find the overall mass of the air, multiply the density by the volume of air in question. To find the weight of the air, multiply the mass by the gravitational acceleration experienced by air (9.81 m/s^2 on the surface of Earth). |
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How do hot - air balloons Which of these explanations
are correct:
1.The balloon acts like a
green house, letting the heat
from the sun warm the air
inside.
2.The burner heats the air
inside and the particles move
apart , so the air inside is
less dense than the cold air
outside.
3.The burner heats the balloon
fabric which expands, making
the volume inside bigger so
the air inside is less dense.
4.The air outside gets cooler
in the evening, so the balloon
rises up.
Can u just tell me the number?
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No.2. The air inside gets hotter, so it rises, and takes the basket along with the balloon. Up and away! |
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the difference between air Could you please tell me the
difference between air
conditioning and air
conditioner?
I knew that we can say that
"this car comes with an air
conditioning" .
How about the following
sentence:
Does your apartment has an air
conditioning /conditioner?
Does this building has an
central air conditioning
system?
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As others have said, an air conditioner is the machine, air conditioning is the result. Note that the machine is an object, therefore countable--you need "an". "Air conditioning" is intangible, therefore non-countable--no "an". >>I knew that we can say that "this car comes with an air conditioning" . You would say just "comes with air conditioning" or "an air conditioning system". >>Does your apartment has an air conditioning /conditioner? (With a question using "do", don't conjugate the main verb) You can say "Does your apartment have air conditioning?" or "Does your apartment have an air conditioner?" >>Does this building has an central air conditioning system? Again, "have" not "has", and it's "a" rather than "an" ("an" only goes right before a vowel sound), but otherwise perfect. "System" is countable. |
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