I was thinking bout this for some reason... oh, I know why.. there is an exploded frozen coke (aka: soda, pop, soda pop, co cola) in the freezer.

Anyway, it reminds me of this time in high school science class, that our teacher told us that water doesn't expand when it freezes. If this is so, then why do we have to wrap our pipes when we have a freeze? Why do we use antifreeze in our cars radiator?

i think it does

and the air might at any rate ,in your coke bottle... or maybe the plastic just shrink, i dunno. I only paid attention to science in highschool if they did cool tests :rolleyes:

Yes. It is one of the few substances that expands when it freezes rather than contracting with cold. That is why Ice floats. It's density is less than the liquid water around. it.

Guess high school in Louisiana ain't what it is cracked up to be :-)

Yeah, it does expand and as Frog said it is one of the few substances that does expand.

hell yeah it does!!!!!! The Frog is correct

Now what I want to know is: Does a bear shit in the woods? :)

I learned that on MacGiever. Was there nothing that man could not do?

One 18 inch length of kite string

One 3/4 inch Superball

Three sticks of chewing gum

One magnifying glass

Two pennies

One folded newspaper

Thirty minutes uninterrupted by bad guys.

Result? He builds a thermonuclear-reaction-controlled escape backpack with death beams and satellite uplink. Impressive fellow.

I always thought that bitch was a dumbass.

Anyways, another thing she said... wider tires do not increase traction. She says that wider tires still have the same amount of friction on the ground, thus not creating more traction (if I remember correctly, that was almost 10 years ago, but stuck with me!) Me and my buds then assumed that the only reason race cars use wider tires is to reduce heat, but she never really elaborated on our thoughts too much. :mad:

it shrinks until 34 degrees F.. I think

then it expands at an increasing rate.. so it actually expands as water until it hits 32 degrees F

atleast that is what I think bill nye the science guy said..

An interesting fact: water is the only one? or one of few elements that floats when frozen. All others sink when put into liquid version of the same element.

Originally posted by ChaoticThoughts
An interesting fact: water is the only one? or one of few elements that floats when frozen. All others sink when put into liquid version of the same element.

And the reason it does? Because it expands in the frozen form therefore having less density that it's counterpart liquid.

Oh, and that whole 'Wider tires' thing? I guess she though having more square inches of tire in contact with the road would have absolutely no additional traction effect. That doesn't sound like a very informed teacher.

Then again, the first Euro History teacher I had in college got the year wrong on the Battle of Hastings. I had to tell her it was 1066. She belligerently didn't believe me, but when forced to consult her text to look it up, I was proven right. I think it embarrassed her most because I knew it off the top of my head.

Originally posted by Geoffrey
I always thought that bitch was a dumbass.

Anyways, another thing she said... wider tires do not increase traction. She says that wider tires still have the same amount of friction on the ground, thus not creating more traction (if I remember correctly, that was almost 10 years ago, but stuck with me!) Me and my buds then assumed that the only reason race cars use wider tires is to reduce heat, but she never really elaborated on our thoughts too much. :mad:
I feel dumb... what's the equation for friction? Isn't it something along the lines of:
area x force applied x coefficient of friction?

EDIT - hmm.. it appears that the equation is only (Force Normal x Coefficient of Friction). So why DO wider tires get better traction?

I thought it was wider tires on dry pavement, and narrow tires on wet pavement?

Originally posted by PFDarkside

I feel dumb... what's the equation for friction? Isn't it something along the lines of:
area x force applied x coefficient of friction?

EDIT - hmm.. it appears that the equation is only (Force Normal x Coefficient of Friction). So why DO wider tires get better traction?

Cause it just makes sense! :P

I believe that isn't the complete equation...cause imagine...that means a pinhead gives as much firction as a huge piece of metal...

I believe that equation for friction is for a 'unit area' but I could be wrong.

As far as I remember.... Liquid water can hold a reasonable ammount of dissolved atmospheric gasses. But the ammount of gas that can be dissolved in water is proportional to temperature. So as ice forms, the total ammount of disolvable gasses grows smaller, until the gas saturation point becomes so low that microscopic bubbles form as the gas is expelled from solution.

Since water can hold a chemical in liquid solution without a change in solution volume, there is suddenly a problem with ice; there is now the volume of water plus all of the excess gas, which accounts for the expansion.

If that's true, as I think it might be, then completely de-ionised water with zero dissolved gas content should not expand as it becomes ice. This ice should also sink in the same pure water.

Kids, it’s time to put our theories to the test. Get out your science kits and let’s go!


Now, I’m going to give this 2 kilo cube of pure sodium metal to my assistant Timmy here. He’s going into the next room and will drop it in the large tub of water while we are all safe on this side of the blast shield. Now, the theory is that since pure sodium reacts explosively to water, this large amount of pure sodium dropped in several hundred gallons of water might make a really big..

*BOOM*

..uh oh. We’re going to need another Timmy.

Originally posted by TheFrog
Kids, it’s time to put our theories to the test. Get out your science kits and let’s go!


Now, I’m going to give this 2 kilo cube of pure sodium metal to my assistant Timmy here. He’s going into the next room and will drop it in the large tub of water while we are all safe on this side of the blast shield. Now, the theory is that since pure sodium reacts explosively to water, this large amount of pure sodium dropped in several hundred gallons of water might make a really big..

*BOOM*

..uh oh. We’re going to need another Timmy.

My science teacher in the 10th grade took a piece of sodium and dropped it in a cup of water, apparently the piece was too big and boom!!! We had fire dripping from the ceiling, he was real shaken up but no one got hurt. :)

Originally posted by Manu


Cause it just makes sense! :P

I believe that isn't the complete equation...cause imagine...that means a pinhead gives as much firction as a huge piece of metal...

I believe that equation for friction is for a 'unit area' but I could be wrong.
I remember doing an experiment in Physics 1 that proved that area had nothing to do with friction. We had like a 4 sq. inch piece of material and a 16 sq. inch piece, and they took the same amount of force to overcome static friction and move. (Proving that area had nothing to do with the amount of friction.) I have since talked to a mechanical engineering friend and he says that the difference is figured into the coefficient of friction.