Can someone please explain to me how water can be 350 degrees?

[tcsenter]

I never knew that pressure upped the boiling point like that.

Conversely, you can get many liquids to boil at typical room temperature by pulling negative pressure. Mercury is always fun to play with.

 

[PlasmaBomb]

Yep. Under pressure, water doesn't go critical until 374F.

The critical temperature of water is 374 C

Fun fact at 297 C benzene becomes completely miscible with water.

 

[PlasmaBomb]

You could repeat that experiment 1000 times and odds are, it wouldn't happen again. However, if you heated the water once in the microwave, allowed it to cool, then heated it again, the odds significantly increase of that happening.

Maybe they had rehearsed it earlier...

^ The reason being, if anyone was wondering, is heating and cooling the water reduces the quantity of dissolved gases present in the water which can act as nucleation sites for bubbles (boiling).

 

[The Boston Dangler]

I don't like you...


The thing that got me thinking about this was an episode of Modern Marvels. They were making huge dump truck tires and were pouring 350 degree water on the rubber to get some chemical reaction to happen. It indeed was under pressure. I never knew that pressure upped the boiling point like that.

Thanks for increasing my ever decreasing knowledge ATOT!

they could have used an additive to increase the boiling point, like using salt with pasta.

 

[Locut0s]

why?

I believe it has somehting to do with removing impurities or something. I know that this usually only hapanes with pure distilled water. I think it has to do with a lack of nucleation sites for bubbles to form. Someone want to refute or confirm this?

 

[Acanthus]

Water boils at 212 degrees at sea level.

Less at higher altitudes where pressure is lower, or in any sort of vacuum.

More with any compression or source of high pressure. See deep ocean thermal vents.

 

[coldmeat]

Wow OP really fails. Water boils at 100 degrees.

 

[SKORPI0]

:awe:

 

[Lounatik]

The fucking magnets,how do they work?

Peace

Lounatik

 

[LTC8K6]

If you ever camped out at altitude, you'll remember that water boils at a lower temperature. So it follows that it would boil at a higher temperature at a higher pressure.

Race cars often run a high pressure cooling system for this very reason.

 

[Howard]

If you ever camped out at altitude, you'll remember that water boils at a lower temperature. So it follows that it would boil at a higher temperature at a higher pressure.

Race cars often run a high pressure cooling system for this very reason.

Don't all modern cars run a (usually) high pressure cooling system?

 

[Fenixgoon]

I thought it turned to steam at 212 degrees?

depends on the pressure. if you increase the pressure, you also increase the boiling point (this is how pressure cookers work).

here's the phase diagram for water: phase diagram

temperature is on the X axis and pressure is on the Y axis. S, L, V mean solid/liquid/vapor.

if you start at ~0,0, you are in the solid field

if you increase temperature to ~200K (go only horizontal), water will turn from solid (ice) to vapor (steam), known as sublimation.

now if you increase the pressure at ~200K (going only up), the vapor becomes solid again.

let's say we take the pressure all the way to 10^6 Pa at 200K.

Now let's increase the temperature while keeping pressure constant. Once we hit about ~275K, the water becomes liquid. If we continue increasing temperature, water will turn to vapor (steam). But at 10^6 Pa, boiling doesn't occur until ~475K, or about 200C.

One way to vaporize things that melt at very high temperatures (any metal basically) is to reduce the pressure, which then lets you boil at a much lower temperature than would otherwise be possible.

 

[Fritzo]

The critical temperature of water is 374 C

Fun fact at 297 C benzene becomes completely miscible with water.

C...F....same thing

 

[schneiderguy]

Wow OP really fails. Water boils at 100 degrees.

In America it boils at 212 cuz our water is better than the pathetic Canadian water that boils at 100.

 

[herm0016]

triple point is fun. all three phases at once! woot!

 

[vshah]

:awe:

atot, i am disappoint that it took this long for this to get posted

 

[herm0016]

i originally came to post the lyrics to "under pressure" by queen.......

 

[Howard]

i originally came to post the lyrics to "under pressure" by queen.......

ice ice baby

 

[tcsenter]

triple point is fun. all three phases at once! woot!

Its almost like a threesome for science geeks!

 

[thepd7]

Wow OP really fails. Water boils at 100 degrees.

In America it boils at 212 cuz our water is better than the pathetic Canadian water that boils at 100.

this

 

[BoomerD]

Duh...you have to heat it twice...maybe 3 times. You just can't get it that hot heating it once...

 

[JTsyo]

PV = nRT

lol ideal gas law? that's stretching your assumptions.

 

[blinblue]

You never mentioned your units. 350 Kevin is a nice hot 76.85 C or 170.33 F. Also, what everyone else has said

 

[lupi]

Have you never seen it raining when temperature was below 32.
Have you never seen details about a steam engine or even modern nuclear plants.

Even a little tea kettle will have water inside over the boiling point.

 

[JEDIYoda]

OP never took junior high chemistry?

Sure in Jr High You learn the boiling point of various liquids.
But depending on the teacher and such you may never get further into what this subject is about!!

Also - there always one in the crowd-- OP never took Jr High Chemistry......sad