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/sci/ - Science & Math

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2014099 No.2014099 [Reply] [Original]

Since water evaporates at 100C, how does it evaporate from our skin when we sweat, or from the ground?

>> No.2014282

>>2014185

>absolute zero is just a theory
>just a theory

does that mean, that one could call absolute zero, a geuss?

>> No.2014286

>>2014116
>>2014099
Temperature is just an approximation of the average kinetic energy of the particles within a sample. Individual particles within any sample however have a wide range of kinetic energies. Even if the average temperature of many particles is less than 100 C, the "temperature" (as it relates to kinetic energy) of an individual particle could be well above 100 C.

>> No.2014107

>>2014099
>evaporate from our skin

>they see me trolling, they hatin

>> No.2014110
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2014110

>>2014099 Since water evaporates at 100C
Nope.
Your confusing evaporation and boiling.

>> No.2014116

OP here, no I'm not trolling.Either way, it goes from a liquid state to a gaseous state.

>> No.2014117

>>2014099
>Since water evaporates at 100C, how does it evaporate from our skin
>water evaporates at 100C
Water <span class="math">\it{boils}[/spoiler] at 100C, it doesn't evaporate. It can <span class="math">\it{evaporate}[/spoiler] at much lower temperatures.

>> No.2014118

Temperature is meerly an AVERAGE measurement of kinetic energy.

IE. At 100 degrees, some water will be moving at above 100 degrees and some will be moving below 100 degrees.

Applying this to 60 degree water, some molecules (very few) have the energy required to phase change into gas and evaporate.

>> No.2014123

>>2014110
I like you; you've been correcting all the idiots along with me for the past 10 minutes, hehe.

>> No.2014127

>>2014099
So water atoms on your skin can evaporate at 100C? Even if the temperature is way less? And what's the difference between boiling and evaporation? They are both changes in states from liquid to gas.

>> No.2014133

>>2014099

>mfw every answers with evaporate != boil rather than vapor pressure and kinetic energy

>> No.2014140

>>2014127 evaporate at 100C? Even if the temperature is way less?

You know Celsius is a unit of temperature right?
>>Can I be going at 100 km/h even if my speed is way less?

>> No.2014149

sure is fags that don't know about fugacity in here

>> No.2014394

don't forget that sweat has salt dissolved in it, which decreases the temperature needed to evaporate slightly.

>> No.2014185

Water evaporates at all temperatures, including ice.

Except for when it is gaseous, because that means it has already been evaporated.

Remember, absolute zero is just a theory, it hasn't been proved and in this universe it is impossible to recreate.

>> No.2014186

>>2014127
I'd be more worried that my skin is hot enough to boil water.

But that's just me.

>> No.2014211

OP, read up on vapour pressure. The basics are that and fluid exerts a certain pressure on the enviroment around it (particles trying to escape). Boiling temperature is the temperature at which the vapour pressure of the liquid is equal to the atmopsheric pressure. This explains why water boils at lower temperatures at higher elevations (lower atmospheric pressure to equalize).

But that's boiling. Evaporation can happen at a much larger range of temperatures. It's all kinetics.

http://en.wikipedia.org/wiki/Vapour_pressure

Good place to start