Go Back  PPRuNe Forums > PPRuNe Social > Jet Blast
Reload this Page >

How long before the oxygen runs out?

Jet Blast Topics that don't fit the other forums. Rules of Engagement apply.

How long before the oxygen runs out?

Reply

Old 12th Apr 2009, 20:55
  #1 (permalink)  
Thread Starter
 
Join Date: Jan 2002
Location: North England
Posts: 447
How long before the oxygen runs out?

I've always wondered why animals were so much larger in the past?

One theory is that oxygen was more plentiful in the time of the dinosaurs.

Given that oxygen levels must have decreased in the intervening period how long before the oxygen runs out, particularly in view of the unprecedented destruction of the environment in recent years?

Maybe bumble bees flew aerobatics in the past and are now reduced to lumbering aviators wheezing at the thought of flight?!

KR

SITW
SpannerInTheWerks is offline  
Reply With Quote
Old 12th Apr 2009, 21:03
  #2 (permalink)  
 
Join Date: May 2001
Location: Newcastle/UK
Posts: 1,473
Well let them breathe cake.
Ere, there is a awful lot of it about,one suspects we talking monkeys will long be dust in the fossil record before oxygen runs out, if ever.

Something else occurs to me,read somewhere that if the percentage of oxygen in the atmosphere where just a tad higher we would probably all be killed by vast forest fires which once started would refuse to go out due due to the abundance of fire loving O,
Perhaps you have stumbled upon yet another reason for the demise of yon Dinosaurs.

Last edited by tony draper; 12th Apr 2009 at 21:16.
tony draper is offline  
Reply With Quote
Old 12th Apr 2009, 21:11
  #3 (permalink)  
 
Join Date: Aug 2005
Location: Soesterberg (NL)
Age: 52
Posts: 61
Just in case, besides books and stamps that will constitute my dayly diet (I can digest cellulose, being an ant), I am accumulating oxygen tanks.
vonbag is offline  
Reply With Quote
Old 12th Apr 2009, 21:22
  #4 (permalink)  

Avoid imitations
 
Join Date: Nov 2000
Location: Wandering the FIR and cyberspace often at highly unsociable times
Posts: 11,677
The largest creature ever on the planet is the Blue Whale and it's still here.

It has obviously survived only by it's remarkable ability to hold its breath.
ShyTorque is offline  
Reply With Quote
Old 12th Apr 2009, 21:31
  #5 (permalink)  
 
Join Date: Mar 2006
Location: Chez Sprog
Posts: 487
Wonder if mothr nature did us lot all over again, she would choose oxygen again.Terrible explosive corrosive nasty thing is oxygen. Personally, I only breath red wine.
Sprogget is offline  
Reply With Quote
Old 12th Apr 2009, 21:44
  #6 (permalink)  
 
Join Date: May 2001
Location: Newcastle/UK
Posts: 1,473
Well the Earth was totally devoid of Oxygen for the first billion years or so Oxygen was bye product of the first lifeforms, none oxygen breathing critters came first,then us,mommy natures first mistake perchance.

Stromatolites,these buggas kicked it all off.
tony draper is offline  
Reply With Quote
Old 12th Apr 2009, 22:10
  #7 (permalink)  
More bang for your buck
 
Join Date: Nov 2005
Location: land of the clanger
Age: 76
Posts: 3,511
Given that oxygen levels must have decreased in the intervening period how long before the oxygen runs out, particularly in view of the unprecedented destruction of the environment in recent years?
The destruction of the environment began several millennia ago when made ceased to be hunter gatherers and started farming.
when you consider that the whole of the UK was in effect forest
which has been cleared to facilitate agriculture modern environmental change is relatively insignificant.
green granite is offline  
Reply With Quote
Old 12th Apr 2009, 22:52
  #8 (permalink)  
 
Join Date: Mar 2006
Location: Chez Sprog
Posts: 487
Yep, if nature was intent on a chalcogen & had a weekend to think it over, she might have gone with Sulphur. No need for noses, lungs or an atmosphere. Just a hinged flap somewhere. Of course, we'd all live on Volcanoes & Lynx & Rightguard would rule the world. probably.
Sprogget is offline  
Reply With Quote
Old 12th Apr 2009, 23:26
  #9 (permalink)  
bnt
 
Join Date: Feb 2007
Location: Dublin, Ireland. (No, I just live here.)
Posts: 704
I was reading a little about this today, the history of atmospheric oxygen: The Great Oxidation Event. The oxygen wasn't always around, but now it's here, it's not about to go away. It can't escape in to space the way hydrogen and helium can - too heavy.
bnt is offline  
Reply With Quote
Old 13th Apr 2009, 00:40
  #10 (permalink)  
 
Join Date: Mar 2006
Location: Chez Sprog
Posts: 487
Very intersting that Bnt. Quite a thought that for the want of a lump or two of Nickel. we might all be looking very different. Nature clearly takes what's at hand & runs with it.
Sprogget is offline  
Reply With Quote
Old 13th Apr 2009, 02:32
  #11 (permalink)  
 
Join Date: Aug 2000
Location: Somewhere very sunny !
Age: 47
Posts: 285
For gods sake, don't tell the government, they will start to tax it !!
Impress to inflate is offline  
Reply With Quote
Old 13th Apr 2009, 07:15
  #12 (permalink)  
 
Join Date: May 2001
Location: Newcastle/UK
Posts: 1,473
Maggie already tried that, it was called the Poll Tax.
tony draper is offline  
Reply With Quote
Old 13th Apr 2009, 08:09
  #13 (permalink)  
 
Join Date: Jun 2001
Location: Fragrant Harbour
Posts: 4,586
Oxygen levels a hundred million years ago were about 32%. It is now about 21%. This is why land animals grew as big as they did and there were dragonflies the size of seagulls. Most of the oxygen has been absorbed into the earth through oxidization. The oxygen is still there, it's just locked up in compounds such as red coloured earth, for example. (Red earth = iron oxide).
Dan Winterland is online now  
Reply With Quote
Old 13th Apr 2009, 09:21
  #14 (permalink)  
 
Join Date: Aug 2000
Location: below sea-level . . . (and on page 32).
Age: 51
Posts: 47
Snoop

Is that where we plant the green plants then ?
My dirt is gray/blackish, green plants seem to grow pretty well though.

Is there more oxygen in the big forrest in Brazil, compared to say downtown London, or does it move about fairly fast ?

Portable oxygen generators in backpacks ?
traveler is offline  
Reply With Quote
Old 13th Apr 2009, 11:54
  #15 (permalink)  
bnt
 
Join Date: Feb 2007
Location: Dublin, Ireland. (No, I just live here.)
Posts: 704
People can adapt to lower oxygen levels, if that's all that happens. Your lungs will work a bit harder, as they do at altitude. However, if the oxygen is replaced by some other gases, then we could have a problem. If you remember the Apollo 13 incident, the main threat to the astronauts was CO2 buildup, not the drop in O2.
bnt is offline  
Reply With Quote
Old 13th Apr 2009, 12:53
  #16 (permalink)  
Recidivist
 
Join Date: Jun 2005
Location: Essex, UK
Posts: 1,239
Just think - if we can get rid of all the oxygen our cars won't go rusty!

They won't run either, so we can have everlasting cars.
frostbite is offline  
Reply With Quote
Old 13th Apr 2009, 12:59
  #17 (permalink)  
 
Join Date: Aug 2007
Location: East Anglia.
Posts: 416
There are many wishing to get rid of Co2, how long, if they have their way, before the planet ignites?
Avitor is offline  
Reply With Quote
Old 13th Apr 2009, 13:14
  #18 (permalink)  
 
Join Date: May 2008
Location: Japan
Age: 66
Posts: 204
Your soil is grey/black because it is reduced and may be packed with oxidising organics (hence reducing the soil).

As the article quoted above states, before about 1.8 billion years ago, all the oxygen produced by photosynthesis was taken up by elements like iron and aluminium. Reduced iron is soluble, and the oceans were full of it. The banded iron formations are the sediment from a rain of iron oxide. When the reducing agents were exhausted, free oxygen was able to build in the atmosphere, giving us what we have now. It's lasted ~1.8 billion years, so I'm not holding my breath

Sidenote. The change from a methane to a nitrogen/oxygen atmosphere would have changed the Earth's climate dramatically (for the climate change sceptics). Not to be confused with "Global Warming", which is an entirely different thing.

Stromatolites in Shark Bay. Been there, done that.
Yamagata ken is offline  
Reply With Quote
Old 13th Apr 2009, 17:29
  #19 (permalink)  
 
Join Date: Jul 2005
Location: Canadian Shield
Posts: 494
HURRRRRRRRRRRRRGGGHHHHHH


i




can't





breathe...................
er340790 is offline  
Reply With Quote
Old 13th Apr 2009, 17:34
  #20 (permalink)  
 
Join Date: Jan 2007
Location: Location: Location!
Posts: 1,775
Maggie already tried that, it was called the Poll Tax.

One of your best ever, Mr Draper!

Jack
Union Jack is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service