Between heat & cold which prevails

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Discussion Overview

The discussion centers around the thermal dynamics between a heated room and an unheated garage when a door is opened between the two spaces. Participants explore concepts related to heat transfer, the nature of "cold," and the perception of temperature.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether heat will flow from the heated room to the unheated garage or if cold will enter the heated space.
  • Another participant asserts that "cold" is not a physical entity but rather a perception, emphasizing that heat flows from the warmer room to the less-warm room until thermal equilibrium is reached.
  • A different participant reiterates that "cold" is merely the absence of heat and explains that faster-moving air molecules from the warmer room will move into the colder room more readily than the reverse, reinforcing the idea that heat is what moves.
  • A humorous remark about the speed of heat versus cold is shared, highlighting the light-hearted nature of the discussion.

Areas of Agreement / Disagreement

Participants generally agree on the concept that heat flows from warmer to cooler areas, but there is a debate regarding the interpretation of "cold" and its role in the thermal exchange.

Contextual Notes

Some assumptions about temperature perception and the definitions of heat and cold are present but not explicitly stated. The discussion does not resolve the conceptual nuances surrounding the nature of cold.

C. McAlexande
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I have a heated room beside an unheated garage. If I open a door between the 2 spaces does the heat go out to help warm the unheated garage or does the cold enter the heated space for cooling the heated room?
 
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You have a conceptual issue here:

There is no such thing as "cold." This is merely an issue of how your body perceives temperature. Think of it this way:

If I connect a warm room to a less-warm room what happens? Obviously the heat flows from the warmer room to the less-warm room (though a combination of mechanisms) until the two reach the same temperature.
 
First, of all, while there is a quantity called "heat" (the average kinetic energy of the air) there is no quantity called "cold". "Cold" is simply the absence of "heat". That is, the only thing that could move from one place to another is "heat".

More specifically, the faster moving molecules of air from the warmer room move into the colder moving room faster than the slower moving molecules of air move from the colder room to the warmer. So again, it is the "heat" that is moving.

(This reminds me of the old joke, "Which is faster, heat or cold?"

Answer: "Heat, because it is easy to catch cold!")
 
HallsofIvy said:
(This reminds me of the old joke, "Which is faster, heat or cold?"

Answer: "Heat, because it is easy to catch cold!")
:smile:

Believe it or not, I've never heard that one before.
 

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