What is Freezing: Definition and 169 Discussions

Freezing is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point. In accordance with the internationally established definition, freezing means the solidification phase change of a liquid or the liquid content of a substance, usually due to cooling. Although some authors differentiate solidification from freezing as a process where a liquid turns into a solid by increasing the pressure, the two terms are used interchangeably.
For most substances, the melting and freezing points are the same temperature; however, certain substances possess differing solid–liquid transition temperatures. For example, agar displays a hysteresis in its melting point and freezing point. It melts at 85°C (185°F) and solidifies from 32°C to 40°C (89.6°F to 104°F).

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  1. C

    Why Does Covered Ice Tray Freeze Ice More Effectively?

    i fill two ice trays, one covered and one not. The ice in the covered tray freezes the ice to the point that the ice is much more difficult to extract from the tray. Why is that?
  2. K

    Freezing rate for water in supercooled ice

    Bit of an odd one here, perhaps, but I'm hoping to get some back-of-the-envelope concept of how quickly a water channel that was melted into a block of -170 degree water ice would re-freeze. It's similar to trying to determine what would happen if I went ice-fishing on a comet in deep space --...
  3. Ivan Seeking

    Broke Freezing: NW Weather Crisis

    I don't know what the weather has been around the nation and world this week, but here in the great NW we have been freezing our buns off! All week we [at our house] were at or below 10 degrees F at night, with daytime highs well below freezing. Today we finally hit 33 degrees with freezing rain...
  4. P

    Freezing point depression calculations

    Homework Statement Hi, I have a problem with the data and calculations part in my lab. For some reason, I can't get a molar mass of the given solutes to match my answer. I'll provide all the equations and my numbers. Please I really need help with this Homework Equations deltaT = m(kf)...
  5. T

    Molar Mass From Freezing Point Depression

    Homework Statement Find the molar mass of a nonpolar molecular compound if 5.52 grams dissolved in 36.0 grams of benzene begins to freeze at -1.87 C? The freezing point of pure benzene is 5.50 C. The freezing point depression constant is -5.12. Homework Equations (Change of...
  6. N

    Effect of freezing on Lithium Ion Batteries

    A quick google search reveals conflicting opinions on whether or not this will have a negative impact on battery life. I carry my laptop outdoors with me every day on my walk from the train to the hospital, do I need to worry about the cold ruining my battery?
  7. W

    Calculating the Freezing Point of Mercury Under Pressure

    Homework Statement The enthalpy of fusion of mercury is 2.292 kJ/mol, and its normal freezing point is 234.3 K with a change in molar volume of +0.517 cm/mol on melting. At what temperature will the bottom of a column of mercury (density 13.6 g /cm3) of height 10.0 m be expected to freeze...
  8. W

    Amazing Thing: 2 Minute Run After Freezing It!

    I love this thing. I don't know how many of you have seen this before, but it is absolutely amazing. Took me quite some time to get it going for so long. Usually, it only went for about 2 minutes and then fell over. Then I had this brainwave to keep it in the freezer for a while. When I took it...
  9. kelvin490

    A new point of view on freezing point.

    It is very hard to have homogeneous nucleation in common situation. Pure water with no nuclei at all will not freeze above -40oC. The presence of impurity particles allow the so-called heterogeneous nucleation to occur so that we can see water freeze at 0oC. It may be reasonable to guess at what...
  10. M

    Chemistry = Freezing Point & Molality

    Homework Statement You have a 10.4g mixture of sugar (C12H22O11) and table salt (NaCl). When this mixture is dissolved in 150g of water the freezing point is found to be –2.24 degrees centigrade. Calculate the percent by mass of sugar in the original mixture. Homework Equations delta...
  11. F

    Chemistry Chemistry freezing point and determination of molecular formula

    1. Homework Statement [/b] question 1: Calculate the mole fraction of benzene in benzene-toluene solution that is in equilibrium at 25 deg. Celsius with a vapor pressure that contains 62% mol Benzene. At 25 deg. Celsisus the vapor pressures of benzene and toluene are 95.1 mm Hg and 28.4 mm Hg...
  12. A

    Theoretical max. pressure of a given quantity of water freezing to ice

    Homework Statement Water in rock crevices often causes erosion when it freezes, given it expands and exerts pressure on the rock. What is the maximum pressure that water can exert when it freezes? T = 263.15 K dice @ 263.15 K = 0.9 g cm3 dwater @ 263.15 K = 1.0 g cm3 Homework Equations...
  13. P

    Falling drop freezing problem

    Hi all, I have a heat transfer problem. In this problem, a water drop (assume sphere) is falling from a very high building. The outside temperature is below zero say -20 degree centigrade. How much time will it take to freeze? I am not able to understand how to model this problem. Which...
  14. S

    Entropy Change of Supercooled Water Freezing Spontaneously

    Homework Statement A 100 g mass of supercooled water at -2ºC in thermal contact with surroundings also at -2ºC freezes spontaneously. Calculate the entropy change of the universe assuming that the surroundings act as a large temperature reservoir. [The specific heat capacity of ice is 2090 J...
  15. Andre

    Rime Ice Time: Perfect Picture in Freezing Fog

    So we need a new picture and the weather is freezing fog. Hence rime ice time. The bigger waters are still open, the fog is more intense there, the place to go for new rime ice pictures. 100% crop 100% crop Now, which one to enter in the contest?
  16. R

    Why does beer freeze when opened in hot temperatures?

    freezing Beer in the Heat! Hey everybody!... the other day i had a few Beers in the refrigirator...i went to get one and i grab one...it was liquid...it wasnt frozen as the others...then when i open it up...it started to frozen from top to botton continuosly!...it took like 15 seconds to do...
  17. M

    Freezing Point Depression and vapor pressure

    Why is the vapour pressure lowered when non volatile solute is added to a solvent? What is the physical reason? Also, why do binary solutions freeze over a range of temperatures, not at one specific temperature? Thanks guys, as usual, for sharing the knowledge!:smile:
  18. P

    Freezing a soda will cause its top and bottom to bulge

    Homework Statement No data Homework Equations No equations. Theory The Attempt at a Solution Freezing the soda can will makes the soda can contract, thus increasing the pressure of the soda. P=F/a. However, as pressure had increase, to the air particles in the soda can will have...
  19. N

    Freezing Water: 100cm³ of Water vs. Ice Cube

    1. The diagram shows a strip of paper tape that has been pulled under a vibrating arm by an object moving at constant speed. The arm is vibrating regularly, making 50 dots per second. What was the speed of the object? A. 2.0cm/s B. 5.0cm/s C. 100cm/s D. 200cm/s Completely clueless...
  20. M

    What Causes Lower Freezing Point Depression: Ionization or Non-Ionization?

    Homework Statement One mole of two different compounds happens to weight the same, but one compound ionizes in water and the other does not. Which will give the lowest freezing point depression? Homework Equations The Attempt at a Solution
  21. M

    Experimentally Determining the Freezing Point of Water

    Homework Statement 1.Antifreeze used in your car is ethylene glycol, HO-CH2-CH2-OH. It is usually diluted 1:1. Assume that you made a solution of 50 g of water (solvent) and 50 g of ethylene glycol (solute). What temperature in Celsius would your car be protected to in cold weather? Assume...
  22. L

    Freezing water in an unexpandable container?

    If you did had a container that was strong enough to resist the expansive forces generated as the water in it freezes, what would happen? (assuming the container is filled completely with water) Thanks for any answers in advance, and I hope this post is in the correct place, if not, then sorry!
  23. E

    Medical Freezing of blood. What happens to it?

    Hey I have to do some spectroscopy of whole blood. But I can only get freezed blood. Is freezed blood different from 20 degree blood. Any chemical differences? does freezing destroy elements of blood. regards MB
  24. Y

    Frozen Salty Water: What's Really Happening?

    Hello, Iv'e freezed a bottle of water, which was feeled up to the top, with no room for air. After I took it out of the freezer I of course licked the ice, and it taseted like salt (not very pleasent)! Is it salt? If you freeze ice in a bottle which does have some space for air this doesn't...
  25. S

    Frog Survival: Uncovering the Genes Behind Antifreeze and Freezing Abilities

    Have they identified the genes behind frogs being able to produce antifreeze and surviving freezing themselves that way? Can anyone shed more light on frogs freezing themselves? thanks
  26. F

    Canada Freezing: Check Out CBC Report

    check it out: or this one: & this CBC report: http://www.cbc.ca/clips/mov/jones-cold080129.mov :bugeye: Luckily for people who don't like the cold it will warm up a bit by the weekend. I like it the way it is though. :approve:
  27. E

    Why does adding salt to water lower the freezing point?

    i was just wondering why salt, when it dissociates into Na an Cl as it is dissolved into water, decreases the freezing point of water. Why does more energy have to be taken out of the system? does it have to do with entropy or what?
  28. M

    Freezing @ 500 degrees centigrade

    i found this in a textbook. at a high altitude the temperature of the atmosphere is 500 degrees centigrade. yet an animal there would freeze to death and not boil. why does this happen?
  29. V

    Calculating Freezing and Boiling Points

    Homework Statement Calculate the freezing point and boiling point of each of the following solutions using the observed van't Hoff factors in Table 11.6. (a) 0.070 m MgCl2 Temp Freezing? Temp Boiling? (b) 0.020 m FeCl3 Temp Freezing? Temp Boiling? Homework Equations...
  30. A

    Why triple point of water is higher than freezing point

    Why is the triple point of water .01C while the freezing point 0C? It seems contradictory.
  31. S

    Freezing Point Depression and Ethylene glycol

    Homework Statement Ethylene glycol, the primary ingredient in antifreeze, has the chemical formula C_2H_6O_2. The radiator fluid used in most cars is a half-and-half mixture of water and antifreeze. What is the freezing point of radiator fluid that is 50% antifreeze by mass? K_f for water...
  32. M

    Surface Water Freezing: Can It Happen?

    Is it possible for water on the surface of a road to freeze even though the temperature of the air just above the road is above 0 degree Celcius? I think the answer is yes but i do not have any theories to support it. It may be because the air above is is above 0 degrees so it tends to rise...
  33. K

    Solving the Mystery of Water Freezing Instantly in a Bowl

    http://www.collegehumor.com/video:1755006 This may be old but... How does this work? They need to have a huge warmth transfer coefficient for this to happen? Maybe the water is at 0°C already and a small amount of energy should be taken to get this effect. Is it electromagnetical or is the...
  34. L

    Computer Freezing Issue: Solutions for Windows XP

    My girlfriend's computer is incessantly freezing, or when it does function it will freeze the minute you go idle for about 20 minutes. It's irking her and I was wondering what the cause of this is and how to fix it? She has a Windows XP operating system.
  35. Pythagorean

    Freezing Cold Energy: Building a Sterling Engine

    I don't pay my electricity bill so if I build a sterling engine going out into the -40 degree weather...
  36. T

    How can I freeze a gallon of water in 5 seconds?

    I have a Gallon of water at room temperature at Sea Level. I want that gallon completely frozen in 5 seconds. Supposing you don't account for impurities (ie. it's pure water)... 1) Is this possible? 2) How cold would it have to be? Let's say you add 50% salt... 1) Is this...
  37. P

    Calculating Molality and Mass of KBr for Freezing Point Depression

    Assume that the density of water is 1.00 g/ml . Calculate the quantity of KBr that would need to be added to lower the freezing point of 535 ml of water by 1.40 degree celsius: What I'm trying to do is the following: Step 1: Tf = Kf . m I took Tf = 1.4 Kf = 1.86 and found the...
  38. A

    Exploring the Anomalous i Value in Freezing Point Depression of KCl Solutions

    Hi Guys, I have a question and its regarding to the freezing point depression lab ... I did an experiment where I had to find an "i" value for KCl. I'm getting 2.4 for "i" ... but the theoratical value is 2. I was just wondering why expriment value os higher than the theortical value ? what...
  39. R

    Computer Freezing: What Could Be Causing It?

    i have a computer that alwaysd worked fine but now when i enter certain folders the whole computer freezes and then everythign restarts?
  40. N

    Freezing point depression error

    So we did an experiment of freezing point depression and my calculated molar mass values were larger than actual... First, the freezing point of the pure solvent had to be determined and so if some of the solvent was on the walls of the test tube opposed to in the solution how would this affect...
  41. W

    POST Logo, Colourful Lines & Freezing

    Almost every time I start up my computer, on the POST logo, it shows like colourful lines, when it goes to anything that has text in it such as the BIOS setup or anything like that, I have these weird characters and all this random stuff, such as the DOS text for smiley faces. It also will...
  42. R

    Freezing light contradicts Einstein?

    In "Frozen Light" an article written by Lene Vestegaard Hau, it talks about Lene's experiments with, literally, slowing down light by way of passing it through "ultra-cold clouds of atoms." The experiment was undertaken at Cambridge and Lene and a group of researchers were able to get light's...
  43. D

    Freezing a cold bottle of water by slamming it?

    Heyas. Recently my brother showed me a trick with a plastic bottle of very cold water. It was out of the freezer, pretty cold, but not frozen. He took the bottle and slammed it against the counter and the bottle froze up. I'm at a loss for explaining why this happens.. The only thing I can...
  44. W

    About Water - Boiling and Freezing

    Water – Boiling and Freezing What started as a question has become my own answer. While waiting the 15 minutes or so for this site to send me my new authorization, I found my answers to… Many years ago I watched a science show hosted by a professor called Julius Sumner-Miller, who would...
  45. P

    The Mpemba Effect: Hot Water Freezing Faster Than Cold

    The Mpemba effect is about the phenomena of hot water freezing faster than cold water. Does anyone know how to pronounce Mpemba?
  46. A

    Ice cream and freezing point depression

    When you make ice cream using a couple of zip loc bags and a salt/ice mixture do the room and surroundings have any effect? Can you be in a warm room and still make the ice cream? Thanks.
  47. B

    A question about water and freezing

    First please note that I have never taken a physics class in my life. The only reason that I have any clue whatsoever about what went on is because of SCUBA equipment and paintball markers. I have completed a brief search in the forums here and have not found a sutible answer. We have come...
  48. I

    Can Moving Water Freeze? - Holiday Question

    Hi Its the holidays and i was just thinking if you have a jar with some water in it and you put it in a freezer say 0 degrees and the jar is constantly being shaken rapidly would the water freeze up over time? or simply if a body of water is moving does the freezing point decrease in...
  49. Astronuc

    Freezing warm water - Mpemba effect

    http://en.wikipedia.org/wiki/Mpemba_effect This has been brought up in the past, but I did not know the effect had a name.
  50. wolram

    Keeping Bits Warm in Freezing Fog

    I got called into work today on my day off, and is was **** cold, it is freezing fog outside and a max of 10c inside, how can i keep my bits warm ?
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