generic image
Processing...
  • Games
  • Catalog
  • Develop
  • Robux
  • Search in Players
  • Search in Games
  • Search in Catalog
  • Search in Groups
  • Search in Library
  • Log In
  • Sign Up
  • Games
  • Catalog
  • Develop
  • Robux
   
ROBLOX Forum » Game Creation and Development » Scripters
Home Search
 

Re: How would i calculate this?

Previous Thread :: Next Thread 
Radioaktiivinen is not online. Radioaktiivinen
Joined: 25 Apr 2009
Total Posts: 18629
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.
Report Abuse
aboy5643a is not online. aboy5643a
Joined: 20 Nov 2010
Total Posts: 2785
19 Nov 2011 01:41 PM
Depends on freezer temperature, material/thickness of container, % water content of the sprite, etc.
Report Abuse
pokelover980 is not online. pokelover980
Joined: 12 Jun 2009
Total Posts: 4141
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.
Report Abuse
Radioaktiivinen is not online. Radioaktiivinen
Joined: 25 Apr 2009
Total Posts: 18629
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
Report Abuse
Radioaktiivinen is not online. Radioaktiivinen
Joined: 25 Apr 2009
Total Posts: 18629
19 Nov 2011 01:46 PM
I put vegetable bag thingies on top of it so it would cool faster.
Report Abuse
Combrad is not online. Combrad
Joined: 18 Jul 2009
Total Posts: 11025
19 Nov 2011 01:55 PM
Thats what we call a variable.
Report Abuse
matchlighter is not online. matchlighter
Joined: 11 Jun 2008
Total Posts: 347
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.
Report Abuse
TehPwnzerLord is not online. TehPwnzerLord
Joined: 15 Sep 2010
Total Posts: 2661
19 Nov 2011 02:17 PM
It would take 4.5 hours.
Report Abuse
Radioaktiivinen is not online. Radioaktiivinen
Joined: 25 Apr 2009
Total Posts: 18629
19 Nov 2011 02:29 PM
water starts freezing at 0 celsius ur all rong.
Report Abuse
aboy5643a is not online. aboy5643a
Joined: 20 Nov 2010
Total Posts: 2785
19 Nov 2011 02:29 PM
water starts freezing at 32 farenheit ur rong.
Report Abuse
myrkos is not online. myrkos
Joined: 06 Sep 2010
Total Posts: 8072
19 Nov 2011 02:34 PM
Fahrenheit is for noobs
Report Abuse
dapbetatester is not online. dapbetatester
Joined: 18 Jan 2010
Total Posts: 1321
19 Nov 2011 02:36 PM
I will guess, 1.6.
Report Abuse
blocco is not online. blocco
Joined: 14 Aug 2008
Total Posts: 29474
19 Nov 2011 02:36 PM
Just get some liquid nitrogen and submerge your sprite into it. No wait necessary.
Report Abuse
ustolemyaccountdark is not online. ustolemyaccountdark
Joined: 24 Aug 2011
Total Posts: 1908
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
Report Abuse
xSIXxStorage is not online. xSIXxStorage
Joined: 22 Aug 2010
Total Posts: 1811
19 Nov 2011 02:56 PM
@SoundwaveWaitSoundIsNotLightSoItShouldntBeHereButItsStillAWavekitten

*centigrade

ololo
Report Abuse
Nikolas5411 is not online. Nikolas5411
Joined: 03 Apr 2010
Total Posts: 2117
19 Nov 2011 04:44 PM
It takes 24 Hours to make that possible.
Report Abuse
Nikolas5411 is not online. Nikolas5411
Joined: 03 Apr 2010
Total Posts: 2117
19 Nov 2011 04:45 PM
If its not a litter bottle, then it would be less than the orignal.
Report Abuse
nightname is not online. nightname
Joined: 10 Jun 2008
Total Posts: 8960
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!

Report Abuse
gyz is not online. gyz
Joined: 27 Aug 2008
Total Posts: 741
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.
Report Abuse
gyz is not online. gyz
Joined: 27 Aug 2008
Total Posts: 741
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...
Report Abuse
MarshaLikezPie is not online. MarshaLikezPie
Joined: 15 Apr 2011
Total Posts: 4054
20 Nov 2011 12:27 AM
32 Degreese Ferinhight and 0 degreese celcious are the same thing.Lolol...
Report Abuse
1waffle1 is not online. 1waffle1
Joined: 16 Oct 2007
Total Posts: 16381
20 Nov 2011 12:35 AM
"starts freezing"

Since when is there a transition form?
Report Abuse
owen0202 is not online. owen0202
Joined: 27 Feb 2008
Total Posts: 6912
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)

Report Abuse
Nikolas5411 is not online. Nikolas5411
Joined: 03 Apr 2010
Total Posts: 2117
20 Nov 2011 09:42 AM
I thought liquid freezes below 20 Degress Farehient?
Report Abuse
owen0202 is not online. owen0202
Joined: 27 Feb 2008
Total Posts: 6912
20 Nov 2011 01:49 PM
Do people still use Fahrenheit?

wow
Report Abuse
Previous Thread :: Next Thread 
Page 1 of 1
 
 
ROBLOX Forum » Game Creation and Development » Scripters
   
 
   
  • About Us
  • Jobs
  • Blog
  • Parents
  • Help
  • Terms
  • Privacy

©2017 Roblox Corporation. Roblox, the Roblox logo, Robux, Bloxy, and Powering Imagination are among our registered and unregistered trademarks in the U.S. and other countries.



Progress
Starting Roblox...
Connecting to Players...
R R

Roblox is now loading. Get ready to play!

R R

You're moments away from getting into the game!

Click here for help

Check Remember my choice and click Launch Application in the dialog box above to join games faster in the future!

Gameplay sponsored by:
Loading 0% - Starting game...
Get more with Builders Club! Join Builders Club
Choose Your Avatar
I have an account
generic image