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Discover LudwigThe phrase 'is air' is not correct and usable in written English.
You cannot use it as a stand-alone phrase in a sentence. To make it understandable, you would need to add more information. An example sentence might be: "The answer to the question of what is sustenance for us all is air."
Dictionary
is air
noun
The atmospheric substance above the surface of the earth which animals breathe, formerly considered to be a single substance, one of the four basic elements of ancient philosophy and one of the five basic elements of several Eastern traditions.
synonyms
Exact(40)
The bldg. is air conditioned.
The system is air travel.
There is air there.
There is air within".
Where there was rock, there is air.
The gas most commonly employed is air.
Similar(18)
It is air-conditioned.
"Luckily there is air-conditioning.
All the massage is air-actuated.
There is air-conditioning and a balcony.
No, New York's problem is air-conditioning.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com