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About 237 years from 2011
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How long has sulfur been known?
== ==
How long has the oxygen concentration of the atmosphere been at its current level?
The oxygen concentration in the atmosphere today (which is at about 21%) has been at its current level for the past 400 million years.
What is oxygen also known as?
oxygen is also known as hyphorm gas
A chemical theory that has been known for a long time becomes a law?
Yes after a long time it can become a law
What is oxygen known for?
it is a non-communistable agent.
Who discovered the Giant's Causeway?
It has been known about as long as people have been in Ireland, so it would not be known who first saw it.
How long has sulfur been known?
== ==
Who and when disccovered the giants causeway?
It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.It has been there as long as people can remember, so it is not known who first saw it and when that was. There have been people in Ireland for at least 8000 years.
How long has the oxygen concentration of the atmosphere been at its current level?
The oxygen concentration in the atmosphere today (which is at about 21%) has been at its current level for the past 400 million years.
How long has oxygen been fully present in the atmosphere?
500 million years
Why is there uncertainty about who really discovered oxygen?
because oxygen has been around for as long as there was sea life and when the first one came out of the sea they technically discovered oxygen
When iron rusts is it a phlogiston theory or a oxygen theory?
It is a process that involves oxygen. The phlogiston theory has been disprooven for a long time.
What is oxygen also known as?
oxygen is also known as hyphorm gas
How long have stars been known?
Since the first man as on earth. Stars have been known for thousands of years!
Is oxygen gas also known for helium?
Oxygen is not known as helium. But a mixture of oxygen and helium is used in the oxygen cylinder for underwater diving.
Why doesnt air have a chemical symbol?
because air is also known as OXYGEN IN A SCIENCY WAY X oxygen is known simply as ''O'' i think because air is also known as OXYGEN IN A SCIENCY WAY X oxygen is known simply as ''O'' i think because air is also known as OXYGEN IN A SCIENCY WAY X oxygen is known simply as ''O'' i think
Why do metals get rusted when exposed to air for a long time?
because air has oxygen in it and rust is also known a oxidation
