Higher temperatures can be achieved by containing the atoms from flying by compressing them at high pressures. At some point, the compressor will also blast, or evaporate. One way it can reach very high temperatures is where the heated matter also provides its compression.
That can happen when gravity itself creates compression so that there is no problem of the blast or evaporation. May be temperatures at the time of big bang, or that of a singularity.
However, the main problem would be that of measuring such temperatures, so, the temperature would be limited by the range of the measuring mechanism.
There's something called the "Planck Temperature" that is the current limit of how hot something can be before the physics we use to describe it breaks down. Within a millisecond after the Big Bang, everything in the Universe was below the Planck Temperature.
Nothing can get colder than that. When there is heat, light waves are given off from the energy being released. We can see the heat from most things unless it is hot enough, and something like fire is. The reason why we can't see human body heat is because the human cannot register the type of light given off. Infrared cameras can see this type of light, so we can see human heat from these.
The waves given off get smaller and smaller as the heat goes up and up. This is why the Planck Temperature is the highest, because the wavelengths become as short as the Planck Length, and as the answer above says, nothing with mass smaller than the Planck Length can exist in the physical universe. Sign up to join this community. Stopping all movement is one thing, but how do we measure maximum movement? How do we take energy up to infinity?
Theoretically, it is possible. As such, it seems that the highest possible known temperature is nonillion kelvins 10 32 K. This is the highest temperature that we know of according to the standard model of particle physics, which is the physics that underlies and governs our universe. Beyond this, physics starts to breakdown. This is known as Planck Temperature. Ultimately, this can only come about when particles achieve what is known as thermal equilibrium.
In order for it to be the hottest temperature, physicists assert that the universe would have to reach thermal equilibrium, with a temperature that is so hot, all the objects are at the same temperature. The closest that scientists think we ever came to this temperature is, unsurprisingly, just after the Big Bang. At the earliest moments of our universe, spacetime expanded so fast a period known as the inflationary period that particles were unable to interact, which means that there could be no exchange of heat.
At this juncture, scientists assert that, for all intents and purposes, the cosmos had no temperature. But this quickly ended. Even the coldest known object in the Universe - the creepy-looking Boomerang Nebula - isn't as cold as absolute zero. Just look at that thing. But what about absolute hot? It's the highest possible temperature that matter can attain, according to conventional physics, and well, it's been measured to be exactly 1,,,,,,,,,,, degrees Celsius 2,,,,,,,,,,, degrees Fahrenheit.
Which, of course, is ridiculous.
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