Why does Boiling water freeze faster than cold water. | |
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Anonymous Coward User ID: 19040320 Iran 12/25/2012 10:14 AM Report Abusive Post Report Copyright Violation | [link to www.rsc.org] Quoting: The Scientist Why does hot water freeze faster than cold water? It seems a simple enough question - yet it has baffled the best brains for at least 2,300 years. Aristotle agonized over it fruitlessly in the fourth century BC Roger Bacon in the 13th century used it to advocate the scientific method in his book Opus Majus Another Bacon, Francis, wrote in his 1620 Novum Organum, that "slightly tepid water freezes more easily than that which is utterly cold" but could not explain why Descartes was defeated by it in the 17th century AD Even perplexed 20th and 21st century scientists and intellectuals have swarmed over it without result i heard this question a lot of times, to me it actually seems quite obvious, why the boiling water freezes first: lets assume the water as a block, 1. in cold water, molecules freeze from outside to inside 2. in boiling water molecules are more free to change their position, which means that molecules from inside "travel" to outside of our "block" exposing themselves to cold, and travel inside again, transporting the cold inside too. and so, cooling the inside faster then in cold water. 3. in boiling water also the space between molecules increases, allowing more cold to enter our water. you could argue, that first water cools down, and then, becomes cold water first, and it shouldnt be freezing faster then. however, if its cold enough around, the boiling water molecules exposed to the cold, start freezing immediately, and transporting the cold inside, thus triggering a faster freezing. in cold water however, the process of freezing is slower, as "the system" is kept "warm" from inside... i am sure, this is the correct answer. if you post it somewhere, do not forget to claim your nobelprize ;) |
kennyrules2005 User ID: 30663141 United States 12/25/2012 10:17 AM Report Abusive Post Report Copyright Violation | Boiled water and its because it removes the excess oxygen molecules, thus letting the water to form clearer more molecularly organized ice. It makes it easier and faster to freeze, less energy. ~ Time devours all things, nothing ever stays the same so why get upset when it inevitably changes. Everything is as it should be. Just go with the flow of life. ~ |
Anonymous Coward User ID: 30746055 Turkey 12/25/2012 10:18 AM Report Abusive Post Report Copyright Violation | As a general rule, boiling water does not freeze faster than cold water. It's a myth. Yes, there can be exceptions if the two water samples are not identical, but then that's a contaminated experiment. The water composition must be exactly the same in order to rule out compositional variables that may change the freezing point of the water. |
Anonymous Coward User ID: 24537691 Canada 12/25/2012 10:25 AM Report Abusive Post Report Copyright Violation | Came down a beautiful frozen icefall. Oh yeah, outside temp is currently -25c. This could keep the kids amused for 15 min or so and get their little brains working on the puzzle. Excellent, learning and fun all rolled into one. |
Anonymous Coward User ID: 30708042 United States 12/25/2012 10:36 AM Report Abusive Post Report Copyright Violation | I'm taking your word that it freezes faster, but.. When water is liquid, the 120degree shape of water molecules allows them to spoon up and lay together in the closest order, but when it freezes, it forms a matrix where everything is the farthest apart. (which is why ice takes more volumn than water) Maybe heated water molecules can move easier into this matrix than water molecules that are just sitting around cold. Imagine a classroom full of rambunctious kids and the teacher tells them to take their seat. It doesn't take long if they run to their seat. But imagine a highschool class full of pot inbibing seniors, just mulling around, and telling them to take their seat. It takes a while for them to move into the seat matrix. |
Anonymous Coward User ID: 30673414 Hong Kong 12/25/2012 11:03 AM Report Abusive Post Report Copyright Violation | The reason is the difference in energy potential. For example, if you have a container with 2 sealed chambers (One filled with water one empty) and open a gate between them the water will fill the empty side at a determinable speed. Now, if you lower the the pressure on the empty side, the water will literally be sucked into the empty container. If you pressurize the water side, the same will happen. What we have, speaking in energy potential, with boiling water freezing faster is essentially a pressurized source discharging into a vacuum. It is only logical that it would lose its energy faster and freeze quicker. |
Anonymous Coward User ID: 30536715 Indonesia 12/25/2012 11:27 AM Report Abusive Post Report Copyright Violation | Easy Hot water is small Cold water is big for example. Teabag in a glass. Pour hot water; the tea seeps out of the bag. Pour cold water; the tea stays in the bag. They cold water is bigger than the perforations in the bag. Hot water is smaller! Obviously. Make it hotter and it turns to steam. Evaporates. So when he throws the cold water it takes more time to freeze cause its bigger. Hot water has less to freeze so its faster.. |
Anonymous Coward User ID: 26473972 United Kingdom 12/25/2012 11:33 AM Report Abusive Post Report Copyright Violation | I think it could be down to the dissolved oxygen in the water, and the warmer the water the less dissolved Oxygen. I'm thinking there is less mass to freeze or the dissolved Oxygen has an insulating effect. As a way to test simply boil two cups of water to get all the dissolved Oxygen out of the water, Allow one cup to cool...then try the experiment. If I'm correct both will freeze at the same time if not then my theory is fucked lol. |
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Maipenrai User ID: 6163263 United States 12/25/2012 11:49 AM Report Abusive Post Report Copyright Violation | If you keep 2 containers with the same weight of water, the cold water freezes faster than hot water. But interestingly at the "triple point" water can exist simultaneously as a solid liquid and a gas. This combination occurs at exactly 273.16 K (0.01 °C) and a partial vapour pressure of 611.73 pascals. |
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Dukembg User ID: 13900834 United States 12/25/2012 12:03 PM Report Abusive Post Report Copyright Violation | Boiling water has more surface area for energy transfer and cools faster.. cold water has less surface area Prepare yourself for the coming power outage!! Thread: Cyber Attack = American Blackout!!! Power Grid Vulnerable! |
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Anonymous Coward User ID: 15993935 Netherlands 12/25/2012 03:24 PM Report Abusive Post Report Copyright Violation | Evaporation? Quoting: Anonymous Coward 15993935 That's why it's also easier to dry yourself off after a warm shower than a cold shower. Too bad a warm shower opens up skin pores and a cold shower closes them. DAMN YOU PHYSICS! pours do not open or close... Widen, narrow, choose your terminology. If you seriously didn't understand - then you have an issue. |
Anonymous Coward User ID: 30844362 Canada 12/25/2012 03:38 PM Report Abusive Post Report Copyright Violation | Here is my simple PHYSICAL (Physics) explanation to whats happening. Quoting: Anonymous Coward 19706474 Imagine Water molecules as cars , the faster the car drives when a car crashes into another car the greater the force exerted on the frame of the car therefore the quicker (FASTER) the cars slow down on impact. Whereas slower cars that hit each other the energy is absorbed like a shock absorber and therefore provides a spring back effect. Upon impact high speed cars or molecules suffer from a different type of stress on the bonds in a similar way a car frame would. [link to www.youtube.com] [link to www.youtube.com] pin this!!! not |
Veresanctus User ID: 26108394 United States 12/25/2012 03:49 PM Report Abusive Post Report Copyright Violation | boiling water evaporates, less water freezes faster than more water Quoting: Anonymous Coward 29757648 I personally think it is because the hotter a liquid or gas is the more the molecules move around. Also when a liquid boils it causes the liquid to circulate inside of the container. Now the reason I think that causes the water to freeze faster is because of the amount of molecules that are directly touching the cold air as opposed to only the water on top getting direct contact and then cooling the other molecules below it. At least that is the only logical explanation I can think of. Quoting: Anonymous Coward 30747832 I've always assumed it was because the greater gradient in temperature change. Quoting: Smith Jefferys Sort of like the difference between rolling a ball down a steep hill and a steeper hill; same energies involved, but a faster process. i'll try to explain. Quoting: Anonymous Coward 30664251 Heat acts as a catalyst for the reaction taking place, we know that, so my theory is that the heat energy in hot water is more easily conducted away from the water, speeding up the reaction. EVAPORATION! ... As many have picked up on the reason is simple when a hot liquid is suddenly exposed to freezing environment since it is already evaporating it loses it's heat faster especially if thrown because of increased surface area (it boils in the air notice all the steam) and then freezes faster, than a cool liquid. SOLVED! Last Edited by Veresanctus on 12/25/2012 03:51 PM GET SAVED: Thread: Are you SAVED from DAMNATION? "For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself. But if ye bite and devour one another, take heed that ye be not consumed one of another. This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh. For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would. But if ye be led of the Spirit, ye are not under the law. Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, Meekness, temperance: against such there is no law. And they that are Christ's have crucified the flesh with the affections and lusts. If we live in the Spirit, let us also walk in the Spirit. Let us not be desirous of vain glory, provoking one another, envying one another." -- Galatians 5:14-26 |