[Bored chemist]

ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting.

Do you understand that I have done those sorts of experiments?

So what?

So there's not much point posting them.

[hamdani yusuf (OP)]

So there's not much point posting them.

Do you understand that you are not the only one who use this forum?

[alancalverd]

Which way will they go?

They all move towards the center of mass. But nothing flows from one to another.

[alancalverd]

What's the distinguishing characteristics of internal kinetic energy heat that makes it different than external kinetic energy gross motion?[/quote]

[hamdani yusuf (OP)]

Which way will they go?

They all move towards the center of mass. But nothing flows from one to another.

Except if they have atmosphere.

[hamdani yusuf (OP)]

What's the distinguishing characteristics of internal kinetic energy heat that makes it different than external kinetic energy gross motion?[/quote]

As you said, the reactor wall doesn't understand the difference between heat and gross motion.

[alancalverd]

Except if they have atmosphere.

Are you suggesting that air is some kind of gravitational shield? Wow!

[alancalverd]

What's the distinguishing characteristics of internal kinetic energy heat that makes it different than external kinetic energy gross motion?[/quote]

As you said, the reactor wall doesn't understand the difference between heat and gross motion.

Er...but it clearly does, since it transmits heat but not gross motion.

[hamdani yusuf (OP)]

Except if they have atmosphere.

Are you suggesting that air is some kind of gravitational shield? Wow!

No. If their atmospheres are large enough to overlap with each other, then some flow of material is to be expected.

[hamdani yusuf (OP)]

Er...but it clearly does, since it transmits heat but not gross motion.

What is the mechanism?

[Bored chemist]

What is the mechanism?

Because heat and gross motion are not the same thing.

[alancalverd]

Imagine you have been hit by a car full of monkeys. What determines the clinical outcome: the speed of the car, or the amount of noise the monkeys were making?

Now imagine you are at a drive-in movie next to a stationary car full of monkeys. What determines your enjoyment of the film: the speed of the car or the amount of noise the monkeys are making? 

 

[hamdani yusuf (OP)]

What is the mechanism?

Because heat and gross motion are not the same thing.

How does the wall know the difference, thus react accordingly?

[hamdani yusuf (OP)]

How does the wall know the difference, thus react accordingly?

How does the wall know the difference, thus react accordingly?

[alancalverd]

Same way as your skin "knows" the difference between the external kinetic energy of a moving car and the internal kinetic energy of a stationary car. Different causes, different effects.

[hamdani yusuf (OP)]

Same way as your skin "knows" the difference between the external kinetic energy of a moving car and the internal kinetic energy of a stationary car. Different causes, different effects.

What's the difference?
That's the question.

[alancalverd]

Internal versus external. I think most people would understand.

If you want to make things complicated for yourself, solve the equations for the velocity profile of laminar flow and thermal diffusivity through a boundary and a moving fluid. In fact there's no need to solve them:  write then down, or just draw a diagram, and you will see why the boundary material doesn't need to "know" anything.

[hamdani yusuf (OP)]

The naming may sound counter-intuitive.
If the kinetic energy causes heat transfer, it's called internal kinetic energy, represented as temperature.
On the other hand, if the kinetic energy doesn't cause heat transfer, it's called external kinetic energy, represented as flow.

[Deecart]

Temperature exists because we can do some measurement.

It could also "exists " because it is the not measured part of some physic formula (like if you add some black energy to confirm some formula), but by chance we can measure it.
Therefore (because it be can measured) because there are multiple possibilies to measure it, for every temperature we are talking about, we need to explain how we are able to give its value (or temperature become senseless).

Temperature is some kind of concept like we have with time.
"Temp" if you refer to latin is somewhat refering to time..

[alancalverd]

If the kinetic energy causes heat transfer,

It doesn't. Internal kinetic energy is heat. Temperature difference causes heat transfer.