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| 19 Nov 2011 01:39 PM |
I need to calculate how long it takes 1.5 liters of water to start freezing in a freezer.
Can you help me find an algorithm i cant find one :c
Cuz im too lazy to go check if mah sprite bottle is going to explode.
Its been in das freezer for liek 25 mins already. |
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aboy5643a
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| Joined: 20 Nov 2010 |
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| 19 Nov 2011 01:41 PM |
| Depends on freezer temperature, material/thickness of container, % water content of the sprite, etc. |
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| 19 Nov 2011 01:42 PM |
| Assuming your Sprite bottle has Sprite in it, then it's going to be different than how long it takes water, so what we give you would be inaccurate for your purpose. |
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| 19 Nov 2011 01:45 PM |
Freezer temparature: idk, -15 Celsius? whats the avarage temp for these...?
container: Normal limonade watever bottle (1.5 l)
water percent: (lets see... 10% sugar 1% Random chemicals...) 89 %
GIMME TIME
error margin of 15 mins plox |
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| 19 Nov 2011 01:46 PM |
| I put vegetable bag thingies on top of it so it would cool faster. |
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Combrad
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| Joined: 18 Jul 2009 |
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| 19 Nov 2011 01:55 PM |
| Thats what we call a variable. |
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| 19 Nov 2011 02:16 PM |
| Water *starts* freezing the moment it hit 32 degrees F. I don't know any algorithms, but you would need to factor in the temperature of the fridge, water and the specific-heat (amount of energy required to change 1 cubic CM by 1 degree C) of water. |
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| 19 Nov 2011 02:29 PM |
| water starts freezing at 0 celsius ur all rong. |
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aboy5643a
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| Joined: 20 Nov 2010 |
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| 19 Nov 2011 02:29 PM |
| water starts freezing at 32 farenheit ur rong. |
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myrkos
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blocco
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| Joined: 14 Aug 2008 |
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| 19 Nov 2011 02:36 PM |
| Just get some liquid nitrogen and submerge your sprite into it. No wait necessary. |
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| 19 Nov 2011 02:43 PM |
| depends on refridgerater temp and wat kind of subtance the bottle is made of and wat was used to create it |
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| 19 Nov 2011 02:56 PM |
@SoundwaveWaitSoundIsNotLightSoItShouldntBeHereButItsStillAWavekitten
*centigrade
ololo |
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| 19 Nov 2011 04:44 PM |
| It takes 24 Hours to make that possible. |
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| 19 Nov 2011 04:45 PM |
| If its not a litter bottle, then it would be less than the orignal. |
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nightname
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| Joined: 10 Jun 2008 |
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| 19 Nov 2011 06:48 PM |
The time taken for water to freeze is much more complicated than that, and there are far too many factors that you missed out.
For an example, a liquid would cool faster depending on the difference in temperatures. The higher the difference, the faster it will cool.
Also, variables such as the impurity of the water would have to be counted, as they also do cause a difference in temperature change. What makes this even more complicated is that position matters too!
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gyz
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| Joined: 27 Aug 2008 |
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| 19 Nov 2011 11:47 PM |
Assuming all we have is water, and air freezer maintains a constant temperature. Heat is transferred by conduction between the air in the freezer and the container, then conduction through the container, then conduction between the container and the water.
Requires calculus. A lot. Even I, who is somehow considered some kind of genius (not on Roblox, but in real life), don't want to solve this. Although I'm sure that many of us here are considered geniuses in real life...
First you must calculate rate of heat transfer between freezer air and container. Rate is proportional to difference in temperature.
Immediately after heat goes from air to container, it starts permeating through the material of the container.
Right when the heat reaches the water, you have transfer of heat between container and water.
Note that this is only transfer of heat. As heat is transferred, temperature increases proportionally as heat is added, and it decreases proportionally as heat is removed. The proportion depends on the specific heat of the substance.
As temperature changes due heat transfer, the rate of heat transfer changes since it depends on temperature difference between the two objects. Because the rate of heat transfer changes, the rate at which temperature changes is also constantly changing...
Now, remember that all three processes of heat transfer (air-container, across the container, and container-water) will be happening at the same time... the air will be at one temperature, the water will be at another temperature, and the container's temperature somewhere in between (in fact the container is colder on the side of the freezer air and warmer on the side of the water) All three processes will affect each other. Meaning the rate of one heat transfer process is affected by the other heat transfer processes since they change temperature.
Now you must note that combining all factors, the rate of heat transfer will be a continuous curve.You can find the temperature because it is proportional to the heat transferred. But first you have to find the total amount of heat transferred at a specific time.
Analogy: CONSTANT RATE A car travels at (10 meters per second). Find how far it travels after 1,2,3, and 4 seconds. Answer: After 1 second, 10 meters. After 2 seconds, 20 meters. After 3 seconds, 30 meters. After 4 seconds, 40 meters.
Past here is calculus. CHANGING RATE Now, a car travels at a changing velocity. It starts at (10 meters per second) and its velocity increases (accelerates) by ((5 meters per second) per second). Find how far it travels after 1,2,3 and 4 seconds. Answer: After 1 second, 12.5 meters. After 2 seconds, 30 meters. After 3 seconds, 52.5 meters. After 4 seconds, 80 meters.
CHANGING CHANGING RATE trolololol Okay, a car starts at (10 meters per second). It starts accelerating at ((5 meters per second) per second). Over time, its acceleration increases at a rate of (((2 meters per second) per second) per second). Find how far it travels after 1,2,4, and 4 seconds. Answer: I don't want to calculate this inside my head, and I'm too lazy to get a graphing calculator....
Want more info? Research position, velocity, acceleration, jerk, snap, crackle, pop.... velocity is change in position, acceleration is change in velocity, jerk is change in acceleration, etc.
------ Oh, and I also mention that when water is freezing, its temperature does not change. |
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gyz
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| Joined: 27 Aug 2008 |
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| 19 Nov 2011 11:49 PM |
Oh, and I forgot...
Do you want to calculate the surface area of the bottle? Heat transfer increases with surface area.
I'm also sure that there's air in your bottle... |
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| 20 Nov 2011 12:27 AM |
| 32 Degreese Ferinhight and 0 degreese celcious are the same thing.Lolol... |
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1waffle1
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| Joined: 16 Oct 2007 |
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| 20 Nov 2011 12:35 AM |
"starts freezing"
Since when is there a transition form? |
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owen0202
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| Joined: 27 Feb 2008 |
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| 20 Nov 2011 09:30 AM |
Too many variables.
Temperature of Freezer, measured from the centre of the bottle's mass. Density of container/Conductive property of container Liquid Starting Temperature Liquid Freezing point (assuming it's just going to be 0)
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| 20 Nov 2011 09:42 AM |
| I thought liquid freezes below 20 Degress Farehient? |
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owen0202
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| Joined: 27 Feb 2008 |
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| 20 Nov 2011 01:49 PM |
Do people still use Fahrenheit?
wow |
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