What is Heat: Exploring Physical Constituents

  • Thread starter Ali Abbas
  • Start date
  • Tags
    Heat
In summary: Without contact"?In summary, according to the speaker, heat is the energy and motion of particles. Temperature is the measurement of this motion. Heat doesn't need other molecules in order to propagate.
  • #1
Ali Abbas
8
0
I don't understand what is heat actually. And what are the physical constituents that make up this entity.
 
Science news on Phys.org
  • #2
Ali Abbas said:
I don't understand what is heat actually. And what are the physical constituents that make up this entity.
Welcome to PF!

Heat is not a physical "thing". It is the name given to thermal energy in transit.
https://en.wikipedia.org/wiki/Heat
 
  • #3
russ_watters said:
Welcome to PF!

Heat is not a physical "thing". It is the name given to thermal energy in transit.
https://en.wikipedia.org/wiki/Heat
According to you, heat is the transit of thermal energy from a higher temperature body to a lower temperature body. I accept your statement about heat, but unfortunately it doesn't satisfy my curiosity. Its because what you stated above defines the flow of heat or exchange of thermal energy, but what actually is thermal energy?
 
  • #4
Ali Abbas said:
... what actually is thermal energy?
There is a wiki article for that too, though it is a bit more complicated since there is more than one source for the energy (such as kinetic energy and chemical potentail energy): https://en.wikipedia.org/wiki/Thermal_energy
 
  • #5
Ali Abbas said:
According to you, heat is the transit of thermal energy from a higher temperature body to a lower temperature body. I accept your statement about heat, but unfortunately it doesn't satisfy my curiosity. Its because what you stated above defines the flow of heat or exchange of thermal energy, but what actually is thermal energy?
The above definition applies for classical thermodynamics. But what i want to know about heat or thermal energy is its nature, source of existence and the physical properties like density, nature or form, propogation technique, dimensions and density.
 
  • #6
Heat is the energy and random motion of particles. Temperature is the measurement of that motion. For example, the less a particle vibrates, the "colder" it is. The more a particle moves, the "hotter" it is. The distribution of heat across many particles is simply the system trying to become equal.
 
  • Like
Likes Ali Abbas
  • #7
Ali Abbas said:
The above definition applies for classical thermodynamics. But what i want to know about heat or thermal energy is its nature, source of existence and the physical properties like density, nature or form, propogation technique, dimensions and density.
"its nature" and "source of existence" is simply what we define it to be. But it doesn't have a physical form. It seems like you are expecting energy to be something it is not. We do get people confused or unsatisfied about this fairly often.
 
  • Like
Likes Ali Abbas
  • #8
russ_watters said:
There is a wiki article for that too, though it is a bit more complicated since there is more than one source for the energy (such as kinetic energy and chemical potentail energy):
Efrain Garcia said:
Heat is the energy and random motion of particles. Temperature is the measurement of that motion. For example, the less a particle vibrates, the "colder" it is. The more a particle moves, the "hotter" it is. The distribution of heat across many particles is simply the system trying to become equal.
thanks for the answer, this is something i was looking for. And it clarifies simply the whole concept.
 
  • #9
Efrain Garcia said:
Heat is the energy and random motion of particles. Temperature is the measurement of that motion. For example, the less a particle vibrates, the "colder" it is. The more a particle moves, the "hotter" it is. The distribution of heat across many particles is simply the system trying to become equal.
Still got to know how thermal energy propogates in vaccuum? And what form of matter is thermal energy made up of. I am using the word 'matter' here because heat can cause variations in dimensions in other bodies of matter without direct contact. This is a property which has similar effects of 'force'. And force is an effect caused by involvement of mass, and mass is a quantity of matter present. Therefore i assume heat to be a non-contact force
 
  • #10
Ali Abbas said:
Still got to know how thermal energy propogates in vaccuum? And what form of matter is thermal energy made up of. I am using the word 'matter' here because heat can cause variations in dimensions in other bodies of matter without direct contact. This is a property which has similar effects of 'force'. And force is an effect caused by involvement of mass, and mass is a quantity of matter present. Therefore i assume heat to be a non-contact force
Heat doesn't need other molecules in order to propagate. In a vacuum, particles can lose quantum kinetic energy (heat) by giving off photons. We see this as infrared light, UV, visible light, etc. Heat doesn't have mass, it is used to describe energy. There is no particle that carries heat, heat is a property of particles. And can you elaborate on what you mean by "heat can cause variations in dimensions in other bodies... Without contact"?
 
  • #11
Efrain Garcia said:
Heat doesn't need other molecules in order to propagate. In a vacuum, particles can lose quantum kinetic energy (heat) by giving off photons. We see this as infrared light, UV, visible light, etc. Heat doesn't have mass, it is used to describe energy. There is no particle that carries heat, heat is a property of particles. And can you elaborate on what you mean by "heat can cause variations in dimensions in other bodies... Without contact"?
It means changes is, shape, size, chemical configuration(ex:-combustion,burning,etc) , melting, push away objects in a particular direction. All these are the effects of 'force' , more likely 'non-contact force'.
 
  • #12
Ali Abbas said:
Still got to know how thermal energy propogates in vaccuum?

Bodies in a vacuum can lose or gain energy by giving off or absorbing electromagnetic radiation. The internal energy gained or lost this way is usually thermal energy.

Ali Abbas said:
And what form of matter is thermal energy made up of.

Thermal energy is not made up of anything. It's simply a way to describe certain properties of matter.

Ali Abbas said:
This is a property which has similar effects of 'force'. And force is an effect caused by involvement of mass, and mass is a quantity of matter present. Therefore i assume heat to be a non-contact force

Heat is not a force at all. It is the transfer of energy from one object to another via convection, conduction, or radiation.

Ali Abbas said:
It means changes is, shape, size, chemical configuration(ex:-combustion,burning,etc) , melting, push away objects in a particular direction. All these are the effects of 'force' , more likely 'non-contact force'.

You're mixing up different terms and concepts. Heat is not a force, nor are any of those things "dimensions" of an object.

Efrain Garcia said:
In a vacuum, particles can lose quantum kinetic energy (heat) by giving off photons.

This isn't correct. Heat is not "quantum kinetic energy".
 
  • Like
Likes Ali Abbas and Efrain Garcia
  • #13
Ali Abbas said:
Still got to know how thermal energy propogates in vaccuum? And what form of matter is thermal energy made up of. I am using the word 'matter' here because heat can cause variations in dimensions in other bodies of matter without direct contact. This is a property which has similar effects of 'force'. And force is an effect caused by involvement of mass, and mass is a quantity of matter present. Therefore i assume heat to be a non-contact force
As said before, heat is not a substance.
It is the transfer of energy from one system to another, through a process other than work.
You seem to keep insisting that heat has some property in and of itself.
That is an old out dated viewpoint unacceptable by today's knowledge.
The caloric theory is an obsolete scientific theory that heat consists of a self-repellent fluid called caloric that flows from hotter bodies to colder bodies. Caloric was also thought of as a weightless gas that could pass in and out of pores in solids and liquids.
 
  • Like
Likes Ali Abbas
  • #14
Drakkith said:
This isn't correct. Heat is not "quantum kinetic energy".
Well, it is a particles movement. Ergo, kinetic energy. It can lose some of this energy by bumping into other atoms, giving off some of that energy directly, or give off photons, decreasing it's kinetic energy. That's why electrons and other particles more when excited by absorbing photons.
 

FAQ: What is Heat: Exploring Physical Constituents

What is heat?

Heat is a form of energy that is produced by the movement of molecules in a substance. It is often described as the transfer of thermal energy from one object to another due to a temperature difference.

How is heat measured?

Heat is measured in units of energy, such as joules or calories. The amount of heat energy in a substance can be measured using a thermometer or a calorimeter.

What are the physical constituents of heat?

The physical constituents of heat include molecules and atoms that make up the substance. These particles are in constant motion and their movement determines the amount of heat energy present in the substance.

How does heat transfer occur?

Heat transfer can occur through three main mechanisms: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact, convection is the transfer of heat through the movement of fluids, and radiation is the transfer of heat through electromagnetic waves.

How is heat related to temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance. As heat energy is transferred to a substance, the particles gain kinetic energy and the temperature of the substance increases. However, temperature and heat are not the same thing and should not be used interchangeably.

Similar threads

Back
Top