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Re: Big daddy wags post# 70765

Saturday, 02/10/2018 12:07:55 AM

Saturday, February 10, 2018 12:07:55 AM

Post# of 86158
I'm going to wager you are not a scientist nor have had any real training in science. Something as simple as you are trying to argue is supported or refuted by facts...observables. Lets take a few of your "opinions" and examine them.

Is the vapor pressure of water quite low at room temperature?
The vapor pressure of water at 72°F is 20 Torr (for reference, the vapor pressure of water at its boiling point 212°F is 760 Torr) Is this quite low? Low is a relative term...20 Torr is enough vapor pressure for water to evaporate readily at 72°F (this is a common observation - a shower stall is dry in a few hours after taking a shower, for example)

Comparing water to other solvents, are most other solvents extremely volatile at room temperature?
You said yes....most other solvents are extremely volatile at room temperature. This is BS, because of your use of most and extremely volatile. You must not have much real knowledge of solvents - there are plenty that are less volatile than water at room temperature, for example ethylene glycol or octane...both have lower vapor pressures than H2O at 72°F Sure there are a number of solvents more volatile than water...some very volatile but there are also many that are less volatile than water.

Then there is:

The vast majority of moisture in the atmosphere got there because of higher than room temperatures across the planet which causes the massive evaporation of water on our planet!

Indeed, if the temperature around the globe were at a constant 72 degrees F there would be little to no rain or snow and there would obviously be no polar ice caps or glaciers.



Ok...first some facts....the average global temperature from 1951-1980 was about 57.2°F. In 2015 it was 1.8°F higher, which would be 59°F. That is 13°F cooler than the 72°F you mention. Of course at any time there are areas that are warmer or cooler, but that is the average...globally. Your opinion is that water at 72°F cannot contribute to the moisture in our atmosphere...& at that temperature there would be no "polar ice caps or glaciers" Hmmmm...given the facts that I have presented - what think you now ??

Then there is the fact that atmospheric moisture is mostly due to evaporation of water from the oceans (71% of earths surface). This will be dependent on ocean surface temperature & the vapor pressure of the water at that temperature. Hawaiian waters average 77 degrees in winter and 82°F in summer...not much warmer than your 72°F. Another fact: the vapor pressure of water at 77°F is 23.7 Torr. If your opinion is that 72°F water is non-volatile - then what about 77° Hawaiian water in winter? I suppose none of the moisture that results in snow in the Rockies during winter comes from evaporation of Pacific ocean waters? According to your opinion..this couldnt be so. Where I live we are getting hammered with snow this winter...where the heck did it come from ?? Eh Sherlock?

Finally, your opinion that "YES water is often considered non-volatile at room temperature!" is baloney. Neither I or any chemist I know would agree with that BS. End of discussion.

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