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A Science Question about Water Boiling and Freezing
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heatherrae
Guest
no, hot water doesn't freeze faster than cooler water, and room temp water doesn't boil faster than hot water. It is all a matter of joules of energy to excite the molecules in the case of boiling water... Before I go on, are you serious?
Where is Mr. Wizard? Samoth? LOL.
Where is Mr. Wizard? Samoth? LOL.
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heatherrae
Guest
You are a mod? I never noticed that. I better quit being a bitch in your threads now. LOL.bran987 said:it's slimmingand pinstripes too
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heatherrae
Guest
hot water =-)
myway
Banned
Boiling happens when the vapor pressure of a liquid is equal to the atmospheric pressure. Is your hot water container open or closed? There's a lot of junk that matters about the whole thing. As far as freezing, a liquid turns solid when the molecules have lower energy than needed to wiggle around it's neighbors. Pressure matters, 2.curling said:
Why? Are u building a meth lab? Nevermind. I don't want to know.
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The Shadow
Guest
myway said:Boiling happens when the vapor pressure of a liquid is equal to the atmospheric pressure. Is your hot water container open or closed? There's a lot of junk that matters about the whole thing. As far as freezing, a liquid turns solid when the molecules have lower energy than needed to wiggle around it's neighbors. Pressure matters, 2.
Why? Are u building a meth lab? Nevermind. I don't want to know.
yes...but not in his question as those are considered constants
...you are referring to the ideal gas law where pv = nRT
With everything equal - warm water will reach its boiling point faster than water that is say 40 degrees colder as long as heating ramp stays the same....reverse it and the same applies to freezing
GoldenDelicious
New member
answer depends on mass of water, solutes and what methods of cooling are applied. there are some circumstances in which the above statements would be true, but for the most part, this is some really dumb stuff
myway
Banned
The Shadow said:
Yea, your right. I was just trying to give an idea about how it all kinda goes. I hate to just answer questions without giving a little idea about why. Maybe that's because I always ask, WHY???????????
I was not about to start talking Phase Diagrams and stuff like that. I just kinda wanted him to know why things are hot or cold.... kinda. That's all.
bigmann245
New member
so does this mean a watched pot really never boils???
bigmann245
New member
myway said:
but its so much fun, i also like to watch ice melt and i always watch the water go down the toilet
bigmann245
New member
myway said:
nah he lost me at room temperature
bigmann245
New member
myway said:
oh... duh im such a tard
boxerjake
New member
Basic thermodynamics , took enough of this crap for my power enginering degree
Water needs to be heated or cooled to obtain a change in physical shape , so warm water is already partly to it's goal of boiling ( which is tempature dependent ) , conversly boiling water has to cool ( or give up more of it's heat ) before it can freeze
Pressures can vary ... like sea level or 3400 feet , mountain climbers trying to melt snow for water takes for ever .
The first law of thermodynamics is : Heat flows from hot to cold
Ever wonder where that condensation comes from on the outside of a beer bottle in the middle of summer ? well ... as the surrounding warm air trys to warm the bottle the air cools and reachs it due point and drops it moisture content on the bottle .
Water needs to be heated or cooled to obtain a change in physical shape , so warm water is already partly to it's goal of boiling ( which is tempature dependent ) , conversly boiling water has to cool ( or give up more of it's heat ) before it can freeze
Pressures can vary ... like sea level or 3400 feet , mountain climbers trying to melt snow for water takes for ever .
The first law of thermodynamics is : Heat flows from hot to cold
Ever wonder where that condensation comes from on the outside of a beer bottle in the middle of summer ? well ... as the surrounding warm air trys to warm the bottle the air cools and reachs it due point and drops it moisture content on the bottle .
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The Shadow
Guest
boxerjake said:
Energy is neither created nor destroyed....
myway
Banned
yeah!
If we keep going like this, we will fall into a deep, yet meaningful discussion about effects of temp. and the origin of it's dependence.......MAYBE THAT will lead us to some nitty gritty catalystidle chat. And when u start thalking about catalysts.... some cowboy always tries to be the life of the party with some, living catalyst talk. Great. I am SO READY for the enzyme rant. Or maybe it won't happen at all. Maybe i'm jumping the gun just a lil' bit.
If we keep going like this, we will fall into a deep, yet meaningful discussion about effects of temp. and the origin of it's dependence.......MAYBE THAT will lead us to some nitty gritty catalystidle chat. And when u start thalking about catalysts.... some cowboy always tries to be the life of the party with some, living catalyst talk. Great. I am SO READY for the enzyme rant. Or maybe it won't happen at all. Maybe i'm jumping the gun just a lil' bit.
bran987 said:it's slimming
I witnessed such an attempt today actually.
megamania500
New member
It seems that everyone forgot where they were- the internet! Here's my first hit of many in Google on the subject:
http://math.ucr.edu/home/baez/physics/General/hot_water.html
http://math.ucr.edu/home/baez/physics/General/hot_water.html
hotzie
New member
Hot water freezes faster than cold water. Most experts say that, all things being equal, cold water freezes faster. However, things are not always equal. A curious phenomenon known as the Mpemba effect can, under some very specific (and poorly understood) circumstances, result in hot water freezing faster than cold water. One of the several possible explanations for this effect involves evaporation: if you start with extremely hot water, a good bit of it will evaporate (and a smaller quantity of water will freeze faster than a larger quantity). And so, according to chemists, this one is not a myth, and this is presumably what my high school chemistry assignment was getting at.
megamania500
New member
Although i posted a google search website, I didn't read it. But from what I understand, though, if you put cold water and hot water into a freezer, you will see steam rising from the hot water but not the cold. As anyone who ever sweated knows, the evaporation of liquid from a wet surface will cool that surface faster than if it was dry. Thus, the evaporation occurring from the hot water (which isn't happening with the cold water) accelerates the cooling process. Thus, the hot water reaches freezing temp quicker.
Sound plausible?
Sound plausible?
Island Son
New member
megamania500 said:
A high school student with his name in the annals of scientific literature. That's pretty cool (no pun intended)
all things being equal, cool water will freeze first.
but i can see how heating a body of water will create internal convection currents; then when it's being cooled those currents will cause the internal heat to be circulated (and therefore removed) faster.
if it's due to currents, putting something in the water to prevent current formation should result in the cool water freezing first.
