EvC Forum: A science question

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Topic: A science question

crashfrog

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Posts: 19762

From: Silver Spring, MD

Joined: 03-20-2003

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Message 21 of 148 (180962)
01-26-2005 9:51 PM

Reply to: Message 19 by Silent H
01-26-2005 4:58 PM

I'm just as nature made me... plus some creepy effects. I was going for a slightly sinister look (it was for a game character). Have I gone too far?

It's like "Devil hippie offers you a line of coke and invites you to his 'pad' to view his trophies from the Disco Wars." Please tell me that hair never actually existed.

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crashfrog

Member (Idle past 1497 days)

Posts: 19762

From: Silver Spring, MD

Joined: 03-20-2003

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Message 31 of 148 (181095)
01-27-2005 11:35 AM

Reply to: Message 25 by Silent H
01-27-2005 4:32 AM

Don't get me wrong, I think it's awesome. In a horrible, horrible way. But if I can conceal my identity behind ancient cabinet art, who's to say but you what avitar to use?

In the grand scheme of things it started with a photo of me in costume (it really isn't a disco shirt, but a medieval one)

If the shirt was laced across the front, that impression would come through a little stronger. And probably not that hard to photoshop.

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	Message 25 by Silent H, posted 01-27-2005 4:32 AM		Silent H has not replied

crashfrog

Member (Idle past 1497 days)

Posts: 19762

From: Silver Spring, MD

Joined: 03-20-2003

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Message 47 of 148 (190375)
03-06-2005 9:46 PM

Reply to: Message 46 by TheLiteralist
03-06-2005 9:36 PM

In fact, unless I am mistaken, ALL heat is infrared radiation (invisible light with long wave lengths).

I think Percy's point is that you are mistaken; all heat is the kinetic energy of atoms. Sometimes this energy is transmitted via IR radiation; other times it is transmitted via the direct collision of atoms.

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	Message 46 by TheLiteralist, posted 03-06-2005 9:36 PM		TheLiteralist has replied

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	Message 54 by TheLiteralist, posted 03-07-2005 12:11 AM		crashfrog has replied

crashfrog

Member (Idle past 1497 days)

Posts: 19762

From: Silver Spring, MD

Joined: 03-20-2003

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Message 78 of 148 (190475)
03-07-2005 12:37 PM

Reply to: Message 54 by TheLiteralist
03-07-2005 12:11 AM

Either I'm wrong or you guys are confusing kinetic energy with heat energy.

There is no such thing as heat energy, to my understanding. For instance, one atom has no temperature. Heat is the epiphenomenon of the motion of many, many atoms in matter. This is the conclusion of the kinetic theory of gases, it's why hot things expand, etc.

"Heat" is simply a label we apply to the level of random atomic movement in a system. That energy can be transmitted via collision (conduction/convection) or via radiation, when photons are emitted or absorbed.

The two forms of energy, while extremely interrelated and interdependant, are completely different forms of energy...I thought.

If they're so interdependant and interrelated that you can't tell the difference, then no, they're not "completely different forms of energy." "Heat" is simply a word we use to model what is actually a consequence of kinetic energy in a system.

This message has been edited by crashfrog, 03-07-2005 12:37 AM

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crashfrog

Member (Idle past 1497 days)

Posts: 19762

From: Silver Spring, MD

Joined: 03-20-2003

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Message 79 of 148 (190478)
03-07-2005 12:41 PM

Reply to: Message 61 by TheLiteralist
03-07-2005 3:05 AM

I think (emphasize: THINK) it is only an illusion that heat is conducted. I believe the kinetic energy is conducted, and the heat results from the increased kinetic energy. Similarly, irradiation increases the kinetic energy--not the light energy--of the absorbing system. However, increased heat results from the increased kinetic energy.

Perfect premises; exactly wrong conclusion. Only kinetic energy is conducted, only photons are radiated; the end result is the movement of kinetic energy. "Heat" is not produced as a result, "heat" is merely the word we use to describe this system of kinetic energy. But there is only kinetic energy, there is no such thing as heat.

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crashfrog

Member (Idle past 1497 days)

Posts: 19762

From: Silver Spring, MD

Joined: 03-20-2003

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Message 83 of 148 (190493)
03-07-2005 2:54 PM

Reply to: Message 80 by Percy
03-07-2005 1:38 PM

Taking the simple case of an atom moving at a constant velocity in a vacuum, why isn't its velocity a measure of its heat?

I'm no physicist, but I don't understand why that would be a useful model. How would you describe its linear velocity in degrees?

We can say that my speed in my car, barrelling down the highway is a measure of my heat as well, but what would be the point? We'd still wind up with a number expressed in miles per hour.

Its velocity is a measure of its velocity. You could call that "heat", but why bother?

This message has been edited by crashfrog, 03-07-2005 14:55 AM

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