>>7762599 heat isn't caused by anything, it is literally energy it's rate of transfer is related to the temperature energy can be transmitted both via momentum transfer when particles collide and light absorption, not just IR light either
>>7762610 Am I being trolled right now? No, heat isn't entropy. All of the things we mentioned so far are well defined concepts with formulas of their own. For example Q=m.c.dT, Q: heat & dT: change in temperature Entropy has several versions that can be defined in various ways, check it out yourself
>>7762831 It's energy being released and energy being captured. A microphone and a set of speakers do the exact opposite thing ; however they both work on the same principle, only one releases a sonic wave and the other absorbs it. I have no idea if my comparison makes any sense, I'm reasonably drunk rn
>>7762831 >So atoms vibrating causes heat, which causes infrared light. >But atoms absorbing and emitting photons causes infrared light
Both. Vibrating molecules can lose energy by emitting a photon. They can also gain energy and start vibrating by absorbing a photon. (Or by knocking into a higher-energy molecule)
The spectrum of emitted radiation is such that, at normal temperatures, most emitted radiation is infrared. Heat it up enough and the peak wavelength will edge into the visible; cool it down enough and most of the faint thermal radiation will be microwaves. Planck's law describes the spectrum.
>>7762599 Both or true, modulo the misuse of the world heat. Most of heat transfer is done though conduction (agitated molecules agitate the nearby ones) and convection (cold molecules move to hot places because which have lower pressure) Infrared heat transmission only becomes perceivable at high temperatures or in vacuum.
>>7763998 I have no idea where you got that impression.
Momentum isn't like energy, where it's a number you add up; it's a vector, with both magnitude and direction.
If two objects have the same momentum in opposite directions, the net momentum is zero. It's totally OK to create arbitrary amounts of momentum as long as something else gets the same momentum in the opposite direction - still totals to zero, so conservation is maintained.
>>7762599 An Electromagnetic wave shakes a particle which releases smaller electromagnetic waves (photons). Photons are crazy little motherfuckers, and when they hit shit that shit gets all excited yo and get real hot dawg.
>>7762599 Molecules absorb infrared radiation and convert that energy to higher translational energy states.
So infrared light "causes" in a roundabout way, but it is not the only cause. Really, it's just molecules absorbing infrared light and converting it into translational energy, which is heat.
This is analogous to molecules absorbing UV, visible and sometimes near infrared light and re-emitting that absorbed energy as a lower frequency of light.
This is also analogous to molecules that absorb microwave radiation and convert into higher rotational energy levels.
All matter will absorb energy in the form of light, and will usually re-emit some of that energy while transferring the absorbed light into another form of energy.
An interesting connection to make here is that absorption of energy to make heat and absorption of energy to make light are mathematically very similar. You could argue that the are identical except for the magnitude of energy involved in absorption. Neat!
>>7762599 It's this shit again They always lied >Chemistry >Atoms look like what we see in Lewis structures >Move up, no that's wrong, actually they have configurations in SPDF and electron in box. Aka Pauli Exclusion principle >then more shit comes in after that
Heat by definition is the energy (mechanical or electromagnetic radiation) that is being transferred from one system to another system.
In a solid the atoms can vibrate and transfer the kinetic force to the particle next to it. How do they transfer this vibration without touching the other atom? Electromagnetic forces between the electron cloud of each atom repel each other when they get to close effectively acting like a "collision" I hope this is a simple enough explanation of how heat transfers conductively and convectively. Conductive for solids and Convective for gases.
But to explain heat as Infrared we need quantum mechanics and Electricity and Magnetism. When 2 particles are about to collide they are moving relatively at a constant velocity. But when the electron clouds get closer they start to repel. This causes the electrons to DECELERATE. electromagnetic waves are created when electrons accelerate and decelerate. This can also be viewed as the atom's energy decreasing. Now if you have a whole bunch of these atoms and a whole bunch of theses random collisions then you will have a lot of radiation being emitted. But that isn't the end of it. The radiation at the inner regions of the solid will get reobsorbed by neighboring atoms and either cause them to move kinetically or re-emit the radiation again and again all in random direction at random energies. If the temperatures are high enough then the atoms or compounds don't undergo any chemical changes (react). This is pretty much black body radiation. It is only at the edges of the solid does the radiation finally escape. For most temperatures on earth this radiation peaks in the Infrared region of EM radiation.
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