/sci/ - Science & Math

[Anonymous No.6801841]

>be on reddit
>be on askscience
>notice question:
>My fifth grader, on a test, said the state of matter of H20 at room temperature is liquid. The answer was gas. What am I missing?
>read replies
>"The best answer is gas"
>mfw

[Anonymous No.6801847]

what did you think it was

[Anonymous No.6801850]

>>6801847
>mfw it wasn't solid

[Anonymous No.6801851]

>>6801841
...wot

[Anonymous No.6801868]

Almost everything is liquid at room temp..

[Anonymous No.6801895]

almost everything is a solid at room temp.

[Anonymous No.6801978]

Almost everything is a gas at the sun's coronosphere

[Anonymous No.6802015]

Almost everything is empty space.

[Anonymous No.6802063]

>>6802015
Best reply

[Anonymous No.6802065]

if theres a solid snake and a liquid snake, is there a gassy snake too?

[Anonymous No.6802068]

>>6801841
Should have assumed the room was in vaccum, I guess.

[Anonymous No.6802075]

It depends on the pressure too.
At 1 standard atmosphere and room temperature it will be a liquid in equilibrium with its vapor.
Maybe the question lacked a good description of the system.

[Anonymous No.6802183]

>>6801841
Link to offending posts, please.

[Anonymous No.6802227]

>>6802183
Been deleted.

[Anonymous No.6802228]

>>6802075
Chem three blew my mind. Learning that practically everything I had been doing for the year could be described by one idea was awesome.

[Anonymous No.6802232]

>>6801978
nope

[Anonymous No.6802348]

It depends on how hot the room is

[Anonymous No.6802352]

>>6802227
But if you read his graph, water at 77F and 1 bar is liquid. The rest of his explanation is conjecture on the nature of the question and the assumptions made. Sure, there might be equilibrium between the liquid and the gaseous phase, but you have to make assumptions to conclude about either. You might have a perfectly filled and pressurized container with zero space. He just assumes that the water is in Earth's atmosphere. I'm not convinced that the gaseous phase is guaranteed or even a "slightly better" answer.

[Anonymous No.6802364]

>>6802352

It's just wiki's phase diagram for water

http://upload.wikimedia.org/wikipedia/commons/0/08/Phase_diagram_of_water.svg

[Anonymous No.6802370]

>>6802364
But on 1 bar at room temperature, the water is liquid
When you use a measure like "room temperature", you're already throwing accuracy out the window, and assuming the conditions of a normal room.
Gas is a stupid answer.

[Anonymous No.6802406]

>>6802075
the equilibrium at standard pressure and temperature overwhelmingly favors the liquid state, anon.

[Anonymous No.6802425]

>>6802227
>>6802352

not only that, he assumes, and wrongly so, that a cup left out in the air is in equilibrium with the air only in a gas state because it will evaporate eventually.

this is incorrect, because the earths atmosphere acts as an infinite resevoir, and so a cup of water cannot ever be in true equilibrium with it.

a proper experiment would put the glass of water in a tightly sealed container, at which point evaporation would stop when the vapor pressure increased, at least until condensation effects acted as a vapor sink.

[Anonymous No.6802556]

>>6802406
This is true.
But please tell that to the water vapor saturating the air around here (right next to the sea). My body can barely sweat, it's disgusting.

[Anonymous No.6802558]

>>6801841
You made the mistake of confusing H20 with H2O, a common mistake many people make. That is why you should write it as <span class="math">H_2 O[/spoiler] and <span class="math">H_{20}[/spoiler].

[Anonymous No.6802572]

>>6802558
Fucking brilliant 8/8

[Anonymous No.6802575]

>>6802558
What the hell is H20?

[Anonymous No.6802586]

>>6802575
A non-existant molecule. It's planar (which it has no reason for) and many of the Hydrogen atoms have 3 bonds which cannot happen. But since i found a simple circle or linear shape too boring, i used that shape to depict it.
Also it's a joke i post sometimes when i see people writing H20.

[Anonymous No.6802619]

>>6802425
A better experiment would be to place liquid water in a sealed bag with no air bubbles.

[Anonymous No.6802626]

>>6802575
Could be this:
http://en.wikipedia.org/wiki/Metallic_hydrogen

[Anonymous No.6802637]

>>6802228
What was that idea?

[Anonymous No.6802875]

>>6802637
I was going to ask this myself but thought I'd get laughed at. Seconded.

[Anonymous No.6802879]

>>6802558

[Anonymous No.6802880]

>>6802875
third

I don't feel so dumb because I have no chem experience.

[Anonymous No.6802888]

>>6802227
a classic example of redditors trying their damndest to be smarter than everyone around them even if it's not appropriate to the context

[Anonymous No.6802894]

>>6802888
AskScience can be answered by anyone with a reddit account.
If they actually have shown they know their shit they'll have a tag by their name that says so.
Troll answers, incorrect answers and answers pulled out of their asses are deleted like this one was.

[Anonymous No.6802917]

>>6802894
>tfw

[Anonymous No.6802954]

>>6802626
this is actually a good response. some of the chem professors at my uni are conducting experiments about metallic hydrogen. at certain pressures, it conducts electricity

[Anonymous No.6803509]

>>6802954
At high enough pressure, anything could conduct electricity.

[Anonymous No.6805033]

>>6802637
>>6802875
>>6802880
I'm not him and my chem courses are not classified by numbers, but I would guess that the idea is related to a shitload of things that can be explained by phase equilibrium, chemical equilibrium(like in kinetics), thermodynamical equilibrium, or something like that.

[Anonymous No.6805061]

>>6802227
Reddit, where being the biggest smartass means that you must be right