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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

hi guys

few days ago i stumbled upon these kinds of problems through the all-mighty Wikipedia.they are very interesting and i thought we should do some here.

me first:

"How much *oxygen* does an average person breathe in with each breath?"

you are allowed to ask me some questions related to this that might help you.

let the games begin!

*Last edited by anonimnystefy (2012-01-27 06:14:06)*

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Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

few days ago i stumbled upon these kinds of problems

I wish you would be stumbling over to the problems you asked me for.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

why so mean?

it's not my fault.and this forum was partially created for helping those in need.if you don't want to help you don't need to!

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

Who is being mean? You did ask me for tougher problems. Also, you asked me on how to complete the cube. Took me 8 hours to clear up that guys gibberish and you have not even been there. How about the derangement problem? That was a dilly. Took me a whole day. It was a great piece of work too, better than anything Einstein ever did. Not Albert the other Einstein.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

I never asked you for derangements,juan did.and i didn't even see the completing the cube text files promised!

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

I never asked you for derangements,juan did.and i didn't even see the completing the cube text files promised!

Both were given to you as promised.

http://www.mathisfunforum.com/viewtopic … 00#p198900

And here is the derangement problem.

http://www.mathisfunforum.com/viewtopic.php?id=17147

Post #1 to #16

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

Now back to the original question.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

hi bobbym

the point is to make reasonable assumtions and ask questions like:"What is the capacity of the human lungs?" or something like that.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

I do not get it but I will copy your question.

What is the capacity of the human lung?

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

well,you cannot ask stuff that would directly give you the answer.look up Fermi's questions on wiki.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

Okay, what is the size of a human lung? That is a Fermi question.

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

it's about 6 litres.

i'm not sure you got it.a Fermi question is what i posted in the first post.what your question is is a question whose answer can help you answer the Fermi question.but your question is valid.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

Hi;

I got that question from a similar one asked by Sheila's future physisicts.

http://mathforum.org/workshops/sum96/interdisc/sheila2.html#2

See the balloons in a room problem.

Now with your answer I know the answer. But do I ask more questions?

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

hi bobbym

well you can if you need to,but you must be aware if your answer is the one which was asked for.

Here lies the reader who will never open this book. He is forever dead.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

hi bobbym

it would be nicer if the answer was given in number of molecules.in fact a saw the question again and realized that i haven't posted it quite correctly.

but,even in the form of liters it's not a good answer.you forgot to take in oe detail about the human lungs.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

I assumed your answer of 6 liters was capacity.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

well it is.but is that the value you need?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

I would say so. Since 1 / 5 of the air is oxygen, 6 / 5 = 1.2 liters is the volume of oxygen in one breath by a human lung.

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

well then i suggest looking at the wiki article on lung capacity.

and once more,give your answer in molecules of oxygen!

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

Molecules! I will go to work on it.

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

hi bobbym

it's not just about molecules.when we breath we don't use our full lung capacity!

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

Checked Wiki and was unable to find a clear answer on percentage of the lungs used.

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,657

hi bobbym

here you are:Tidal volume

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,473

Hi;

That is giving a weight to volume ratio, I do not know the weight.

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