hot,cold,warm, or cool .... where did it come from?

[reptiles11]

This is kinda of hard to explain, but where does cold,hot,warm, and cool states come from? Was it created at the beginning of the universe? Also it can't be created by our minds because "hot" had to be at the beginning of the universe to create new chemicals through fusion or fission.

If I have made any mistakes please tell me (future reference).

[ecoli]

there's no such thing as 'cool.'

 

Heat is merely the kinetic energy of a substance represented by motion of particles. This motion causes friction in the infrared spectrum that we perceive as heat.

 

Cold or cool occurs when you skin is in the presence of a substance with less kinetic energy than you skin. Since heat energy tends to diffuse from areas of high concentration to low concentration, cold is actually the heat moving off your body into the surrounding environment.

[thedarkshade]

Was it created at the beginning of the universe?

Wait till may!

 

Heat is the rapid (but microscopic in distance) shake of molecules, I have often heard of heat as the hidden kinetic energy (dunno exactly why). Now cold, it less hot, and the other way around. IMO you got only hot, and depending on how much hot you got, then you also have too hot, chilly, fresh cold and other stuff.

[Klaynos]

This is kinda of hard to explain, but where does cold,hot,warm, and cool states come from? Was it created at the beginning of the universe? Also it can't be created by our minds because "hot" had to be at the beginning of the universe to create new chemicals through fusion or fission.

If I have made any mistakes please tell me (future reference).

 

These words are just words we use to compare stuff, normally to our own body temp. They're like "tall" they have no real physical meaning.

 

Temperature is a measure of the average kinetic energy of molecules in something.

 

Heat is energy TRANSFER! A measure of how energy moves from one place to another, in a specific way.

 

The universe on average was hotter at the start than it is now (the word hot is used here comparatively meaning the temperature then was larger than it is now), it was in fact so hot that not even atoms could form!

[swansont]

there's no such thing as 'cool.'

 

Tell that to Fonzie.

 

Cool/cold is just an arbitrary temperature threshold.

 

Heat is merely the kinetic energy of a substance represented by motion of particles. This motion causes friction in the infrared spectrum that we perceive as heat.

 

That's temperature or thermal energy; heat is actually energy being moved around, or the process by which that happens, rather than a substance an object contains. An object with a uniform temperature in thermal equilibrium will have equal amounts of heat entering as leaving — there is no net heat flow.

 

Also, one needs to be careful not to draw the conclusion from this that infrared and heat are the same thing.

 

Cold or cool occurs when you skin is in the presence of a substance with less kinetic energy than you skin. Since heat energy tends to diffuse from areas of high concentration to low concentration, cold is actually the heat moving off your body into the surrounding environment.

 

That's an important point — the body is a good sensor of heat flow, not temperature.

[thedarkshade]

Heat is energy TRANSFER!

Heat IS a form of energy!

[Klaynos]

Heat IS a form of energy!

 

Let us consider the first law of thermodynamics:

 

dU = dQ - dW

 

dU is the change in energy,

 

dQ is the heat

 

dW is the work done.

 

dQ = TdS

 

Oh look an energy transfer not energy.

[D H]

Mass and temperature are definable and measurable attributes of an object. Obsolete theories of heat such as the phlogiston and caloric theories tried to attribute heat as yet another attribute of an object. However, the heat transfer differentials mentioned by Klaynos are path-dependent. Because of this, it simply doesn't make sense to talk about the "heat content" of an object. The "heat content" theories had to be discarded because the amount of heat transfered to or from an object in transitioning from one state to another depends not only on the initial and final state but also depends on the way the object is made to change state.

[reptiles11]

Thanks and I forgot about cold not being real.