The Post Whatever Thread

Heat is the internal kinetic energy associated with thermal motion of atoms and molecules, that flows between bodies at different temperatures.
Technically, the internal kinetic energy is just called "internal energy" or sometimes "thermal energy".

The term "heat" tends to be reserved in Physics these days to describe energy that is transferred from a hotter body to a colder one, due to a temperature difference between them. This is distinct from "work", which is a transfer of energy due to the action of forces between bodies.

Thus, objects can't be said to "have heat". They "have" thermal energy, or internal energy. They can transfer heat to other things. They can also do work on other things by exerting forces.
 
Technically, the internal kinetic energy is just called "internal energy" or sometimes "thermal energy".

The term "heat" tends to be reserved in Physics these days to describe energy that is transferred from a hotter body to a colder one, due to a temperature difference between them. This is distinct from "work", which is a transfer of energy due to the action of forces between bodies.

Thus, objects can't be said to "have heat". They "have" thermal energy, or internal energy. They can transfer heat to other things. They can also do work on other things by exerting forces.
Fearing just such a lecture :biggrin:, that’s what I was trying to convey, by mentioning flow between bodies at different temperatures.

It does seem to me , though, rather unsatisfactory for modern usage not to have a concise term for the internal energy due to thermal motion.
 
It’s Friday the 13th, do you feel superstitious on this day? What does superstition really mean?

Definition - to have fear of the unknown or hold a belief that certain things or days or events will bring about bad luck.

Superstition has spawned intolerance and probably can be blamed for cults forming and horrific abuses due to groups buying into their specific “brand” of superstition.

But just in case, be careful out there today. :wink:
 
391602650_7495016783845794_519955537388070052_n.jpg
 
That makes no sense from an energy conservation viewpoint. The energy required to split helium is identical to that released when it formed. What you are proposing is some kind of perpetual motion, free-energy device, which is ruled out by the laws of thermodynamics. So you don't need to worry about that.
Right. Thank you.
 
You cannot convert more that a limited proportion of heat energy into other forms (2nd Law of TD). For instance, the most efficient thermal power generators (combined cycle) can only convert 50-60% of the input heat into electricity. The rest is waste heat. So you can never get a perpetual loop going.
Right. Current thermal power generators cannot convert 100% of input heat into electricity. There is always a good deal of waste heat.
 
Right. Current thermal power generators cannot convert 100% of input heat into electricity. There is always a good deal of waste heat.
Not just "current" thermal power generators. It applies to any device converting heat to another form of energy, whether now or in the future.
 
~Deleted post~

I forgot about Seattle’s stargazing thread under “Astronomy,” so posted my pic of the moon there.
 
Last edited:
Back
Top