Science question........

[R2B2]

In still air, does the ambient temperature surrounding a cooling object effect the rate at which that object transfers heat.....??

In other words, if an object that had a uniform temp of 80 degrees c was placed in an environment of 30 degrees c, would it cool slower than if that environment was 20 degrees c.....??

 

[BlackBirdBaz]

Yes............

 

[Jaws]

I concure. Yes.. Only reason I know that for sure is cos it was on a program a few weeks ago

 

[BlackBirdBaz]

Pheweeeeeee well it was a 50/50 guess so had a fair chance at getting it right.

 

[stan the man]

yes.....

yes,..'cause them two said so
































:blush:

 

[Pugwash]

The rate of heat transfer is surely relative to the heat difference between object and the environment, amongst other things.

 

[derek kelly]

There is a theory that boiling water freezes faster than cold water, something to do with the amount of evaporation in the cooling process if I remember rightly, I believe the figure is around 12% loss due to evaporation.

 

[Bob Pinder]

Rob
The answer is yes as the same principle applies to, say, you getting cold.
For example if you jumped into an icy pond then you would lose body hear rapidly as opposed to jumping into a jacuzzi where you would probably experience a gain in body heat.

There is a twist to the jacuzzi theory though - because if I jumped into one and found Rolfy Dave there it would send more than a shiver down my spine :m

 

[Coggy]

Yes... %$fan

 

[R2B2]

LOL @ Bob!! Made I larf that did!!

The rate of heat transfer is surely relative to the heat difference between object and the environment, amongst other things.

Mmmm.... that's what I was wondering, but I'm just not sure........

Can anybody explain indepth, with the reasons, theories etc, what goes on with heat transfer etc?

It's necessary I get this right, the reasons I need to know are quite important. Bear with me...... I'll explain later.

 

[BrisbaneBlackbird]

Heat transfer - the science

You guys should send this to Brainiac!! - see the difference in heat loss of a bikini clad girl in a 10degree pond and a -10 degree pond!!

onto the serious

heat is energy dissapation of the molecules bouncing around colliding with each other - the more energy, the faster, the more collisions, the more heat. Lower the heat, less collisions, less speed, less heat.

heat transfer - so u have some air thats hot with molecules moving rapidly meets cold air with slow molecules - the two meet and the fast molecules at the edge of the hot air collide with the slow molecules at the edge of the cold air and this collision imparts some of the hot air molecule energy into the cold air molecule, thus slowing down the hot air molecule (cooling) and speeding up the cold air molecule (heating) - then the law of equillibrium comes into effect and you end up with an even temperature .


so this is how the heat of one object is shared with another - law of equillibrium prevents the hot object getting colder than the cold object heats up to - without some external influence (an external source of energy)

hope this helps

ken

 

[ianrobbo1]

You guys should send this to Brainiac!! - see the difference in heat loss of a bikini clad girl in a 10degree pond and a -10 degree pond!!

onto the serious

heat is energy dissapation of the molecules bouncing around colliding with each other - the more energy, the faster, the more collisions, the more heat. Lower the heat, less collisions, less speed, less heat.

heat transfer - so u have some air thats hot with molecules moving rapidly meets cold air with slow molecules - the two meet and the fast molecules at the edge of the hot air collide with the slow molecules at the edge of the cold air and this collision imparts some of the hot air molecule energy into the cold air molecule, thus slowing down the hot air molecule (cooling) and speeding up the cold air molecule (heating) - then the law of equillibrium comes into effect and you end up with an even temperature .


so this is how the heat of one object is shared with another - law of equillibrium prevents the hot object getting colder than the cold object heats up to - without some external influence (an external source of energy)

hope this helps

ken

nope!! still havnt got a clue!!! :dunno:
so nothings changed there then!!