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. S

    Calculating Freezing Point of 50% Antifreeze Radiator Fluid

    What is the freezing point of radiator fluid that is 50% antifreeze by mass? for water is 1.86 . I used delta: K_fc_m First I found the molar mass of ethylene glycol to be 62.07 g/mol. Then I multiplied 1/62.06 by 500g/1 kg to get 8.06 mol/kg for cm. I plugged these values in and got 15 C...
  2. P

    Freezing Water with a Reversed Steam Engine

    The steam engine which operates between 500°C and 200°C is run in reverse. How long would it take to freeze a tray of a dozen 37 g compartments of liquid water at room temperature (20°C) into a dozen ice cubes at the freezing point, assuming that it takes 300 W of input electric power to run it...
  3. G

    Can Earthworms Survive Months in Sub-Zero Temperatures?

    im doing a science project on cryonics and preserving live tissues and simple live organisms. i am experimenting with finding ways to keep Earthworms alive for extended amounts of time(months even) in sub zero environments(-20°C or lower). it is a common fact that Earthworms can survive for a...
  4. K

    How Accurate is the Freezing Point Calculation for Ethanol at 1000 atm?

    ethanol 46g/mol freezes at 3.65degC density changes from 0.789g/cm-3 to 0.801g/cm-3 latent hear of fusion 8.68kJ/mol. freezing point at 1000 atm. i calculated the ansfer from an example and just want to verify if its correct. dp/dt=(dfusH)/(t*dfusV) rearanged to dt=(dp*t*dfusV)/dfusH...
  5. F

    Boiling & Freezing water at the same time?

    OK, I'm not a science person. I'm an elementary ed major and we have to take classes in physical science to get the basics. So, my problem is in plain English! This month, I have to do a 10 page research paper and presentation on "Boiling water and freezing it at the same time." Now...
  6. E

    Freezing Point Depression

    if i have some of my unknown sample which remains unmelted and undissolved on the walls of the test tube, will this error cause the calculated molecular mass to be too high or too low? i've thought about this and my guess is that the molecular mass would be too high because the colligative...
  7. F

    Revivable Shallow Freezing: The Future of Cryogenics?

    I read about this, it seems diffferent from cryogenic freezing. I'd like to be frozen but revivable...what do you think about this. Do you think I could be frozen like this and revivable? (In a different way from cyrogenic freezing) Shallow Freezing: Using a blood-substitute containing an...
  8. P

    Why Lake Tahoe Doesn't Fully Freeze

    This is a physical intuition problem I don't quite understand fully. The question is, why doesn't Lake Tahoe freeze (the whole Lake)? I know the crystal structure for water breaks at 4 C and the volume is at its lowest point at that temperature. If the temperature above the water is...
  9. A

    Mysterious Freezing Patterns: What Causes Them?

    The last few days have been very cold and when I come back to my car, water has condensated (to solid phase) in the windows. I have noted that the ice seems to form in lines that cross each other (forming seemingly random patterns made of almost perfectly straight lines) Of course there is...
  10. M

    Can salt lower the freezing point of substances and make them harder to melt?

    im confused... we add rock salt to ice cream to lower freezing point. but how dose that help in making ice cream? and when we add salt to the snow on the streets in order to melt them, dosent that also lowers the freezing point? dosent that makes the snow harder to melt? thanks
  11. BasketDaN

    Containers Structurally Able to Hold Freezing Water?

    What kinds of tanks are capable of resisting these types of pressures? (30,000 psi). I can't find any tanks that can. I would assume extremely thick steel could, but I can't find any specific tanks/containers in production that can. What naturally occurring rocks are able to not crack when...
  12. P

    Calculating Freezing Point Depression with Urea and Water

    How many grams of urea (MW = 60.056 g/mol) would have to be dissolved in 115.0 grams of water to lower the freezing point by 1.60 degrees celsius? Equation for freezing point Tf= Kf x Cm Kf= 1.858 Cm= molality of solute in kg please help, iam getting the same answer
  13. U

    Can a Wasp Resurrect After Freezing?

    I heard if you put a wasp quickly in a freezer then thaw it some time later, it comes bacl to life. I am guessing the wasp would on average live as long as it would if it had not been frozen?
  14. C

    A Curious Question About Freezing

    Here's a question I've been thinking about for a while; maybe you guys could provide some guidance. If the air temperature is below 0 degrees Celsius, the water at the surface freezes to form ice, right. Now the question I have is: why doesn't freezing occur throughout the entire volume of...
  15. loseyourname

    Fuel Line Freezing: Possible in Movie or Reality?

    There is a scene in the movie The Day After Tomorrow in which the temperature over Scotland rapidly drops to -150 F. The fuel lines in three helicopters freeze almost instantly and the helicopters fall out of the sky. That didn't seem too plausible to me. If any of you work with such fuel lines...
  16. BasketDaN

    Force exerted by the expansion of freezing H2O

    How much outward force is applied when liquid H2O freezes, turning into ice?
  17. D

    Why Does Sugar Water Freeze Faster Than Pure Water?

    when an ice berg freezes in salt water, the ice is actually pure water because the freezing water kind of pushes the salt out. so why does the suger in koolaid freeze with the water. i asked my chemistry teacher and he looked for the answer but he doesn't know why. this may seem like a stupid...
  18. BasketDaN

    How Much Pressure Does a Gallon of Freezing Water Exert

    How many pounds of pressure are exerted by a gallon of freezing water?
  19. M

    Boiling point vs. freezing point

    this is going to sound like an odd question, but which element has its boiling point and its freezing point closest together? by which i mean, which transitions through the phases the fastest?
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