[dean]

  at Darkside!   Now thats too Funny!! 

Yeh, I guess it would depend on how much is a little etc?  I have to admit I don't know jack squat about hydrogen... how much can we get from a gallon of water anyway?

[denny]

at Darkside!   Now thats too Funny!! 

Yeh, I guess it would depend on how much is a little etc?  I have to admit I don't know jack squat about hydrogen... how much can we get from a gallon of water anyway?

Well, since water is 2 hydrogens to an oxygen, maybe 2/3 of a gal. would be a reasonable guess?

[dean]

So sooner or later we will all have to quit brewing beer if we use water to extract they hydrogen right... I mean water shortage or perceived water shortage?

[punatic]

at Darkside!   Now thats too Funny!! 

Yeh, I guess it would depend on how much is a little etc?  I have to admit I don't know jack squat about hydrogen... how much can we get from a gallon of water anyway?

Well, since water is 2 hydrogens to an oxygen, maybe 2/3 of a gal. would be a reasonable guess?

Well... no, for several reasons. One reason is hydrogen is a gas, and as such is highly compressible.  Water is a liquid and is very nearly incompressible.  Comparing volumes of hydrogen to volumes of water is complicated.

[tschmidlin]

at Darkside!   Now thats too Funny!! 

Yeh, I guess it would depend on how much is a little etc?  I have to admit I don't know jack squat about hydrogen... how much can we get from a gallon of water anyway?

Well, since water is 2 hydrogens to an oxygen, maybe 2/3 of a gal. would be a reasonable guess?

Well... no, for several reasons. One reason is hydrogen is a gas, and as such is highly compressible.  Water is a liquid and is very nearly incompressible.  Comparing volumes of hydrogen to volumes of water is complicated.

But it's for that reason that Denny is absolutely right!  A gallon of water is 2/3 gallon of hydrogen (given the proper pressure and temperature).

[ccarlson]

at Darkside!   Now thats too Funny!! 

Yeh, I guess it would depend on how much is a little etc?  I have to admit I don't know jack squat about hydrogen... how much can we get from a gallon of water anyway?

Well, since water is 2 hydrogens to an oxygen, maybe 2/3 of a gal. would be a reasonable guess?

Well... no, for several reasons. One reason is hydrogen is a gas, and as such is highly compressible.  Water is a liquid and is very nearly incompressible.  Comparing volumes of hydrogen to volumes of water is complicated.

But it's for that reason that Denny is absolutely right!  A gallon of water is 2/3 gallon of hydrogen (given the proper pressure and temperature).

Sorry, but you can't relate the volume of water with that of hydrogen. Punatic is correct.

[theDarkSide]

Come on guys...let's not split atoms 

[Beer Monger]

Come on guys...let's not split atoms 

Unless they can come up w/ something like "Mr. Fusion" so we could run our cars on the energy it produced!   

Hey!  I guess Miller Lite IS good for something!  Go Dr. Brown!

[dean]

Sorry, Beer Monger... but thats NOT Miller Lite.... thats Miller High Life in the pic.      

Punatic and CCarlson... I'm a refrigeration guy so P/T is almost second nature to me and what you two said is exactly why it confuses me.   

[punatic]

Come on guys...let's not split atoms 

Oh... allright.  But splitting molecules is OK, yah?   

And ideally,  it's PV=nRT.   

[punatic]

Gas prices jumped up 11₵/gal overnight here last night..

$4.18→ $4.29

[tschmidlin]

at Darkside!   Now thats too Funny!!  

Yeh, I guess it would depend on how much is a little etc?  I have to admit I don't know jack squat about hydrogen... how much can we get from a gallon of water anyway?

Well, since water is 2 hydrogens to an oxygen, maybe 2/3 of a gal. would be a reasonable guess?

Well... no, for several reasons. One reason is hydrogen is a gas, and as such is highly compressible.  Water is a liquid and is very nearly incompressible.  Comparing volumes of hydrogen to volumes of water is complicated.

But it's for that reason that Denny is absolutely right!  A gallon of water is 2/3 gallon of hydrogen (given the proper pressure and temperature).

Sorry, but you can't relate the volume of water with that of hydrogen. Punatic is correct.

Yes, he is correct that it is complicated.  But of course you can relate the two.

I'm not using actual numbers right now, but if we assume 1 gallon of pure water at a given temp, that will be n moles of water.  When split, that will give n moles of H2.  PV=nRT.  If V = 2/3 gallon, n is what was calculated, R is a constant.  The only variables left are pressure and temperature.

So as I said "Denny is absolutely right!  A gallon of water is 2/3 gallon of hydrogen (given the proper pressure and temperature). "

[ccarlson]

at Darkside!   Now thats too Funny!!  

Yeh, I guess it would depend on how much is a little etc?  I have to admit I don't know jack squat about hydrogen... how much can we get from a gallon of water anyway?

Well, since water is 2 hydrogens to an oxygen, maybe 2/3 of a gal. would be a reasonable guess?

Well... no, for several reasons. One reason is hydrogen is a gas, and as such is highly compressible.  Water is a liquid and is very nearly incompressible.  Comparing volumes of hydrogen to volumes of water is complicated.

But it's for that reason that Denny is absolutely right!  A gallon of water is 2/3 gallon of hydrogen (given the proper pressure and temperature).

Sorry, but you can't relate the volume of water with that of hydrogen. Punatic is correct.

Yes, he is correct that it is complicated.  But of course you can relate the two.

I'm not using actual numbers right now, but if we assume 1 gallon of pure water at a given temp, that will be n moles of water.  When split, that will give n moles of H2.  PV=nRT.  If V = 2/3 gallon, n is what was calculated, R is a constant.  The only variables left are pressure and temperature.

So as I said "Denny is absolutely right!  A gallon of water is 2/3 gallon of hydrogen (given the proper pressure and temperature). "

That's kind of like saying a gallon of sugar will produce a gallon of cotton candy. Uhhhh, nope.

The correct answer is that a gallon of water will produce approximately 4700 liters of hydrogen. You could say you will compress that to 2/3 of a gallon, but I could argue that you could compress it to 4000, 3000, 2000, liters, etc, That answer is meaningless.

If you went to your gas station  and paid for 1 gallon of gas and you only ended up with a few drops you wouldn't be very happy.  But what if the owner told you that you purchased 1 gallon of gas vapor, would you feel any better? 

[tubercle]

I appeal to Denny to amend his answer to "2/3 of the total".

 Sir, the floor is tended to you....

[tschmidlin]

The correct answer is that a gallon of water will produce approximately 4700 liters of hydrogen. You could say you will compress that to 2/3 of a gallon, but I could argue that you could compress it to 4000, 3000, 2000, liters, etc, That answer is meaningless.

It isn't meaningless at all - given a pressure, volume, and temperature it is a precise amount of gas.  In fact, your answer of 4700 liters is just as "meaningless", because you have not specified pressure and temperature. 

Obviously the volume can be pretty much whatever you like, I never said it made practical sense to think of it that way.  The point was to make sure Denny was right.  And he is, under the right circumstances.   Just accept that Denny was right and we can move on.