Negative Kelvin temperatures occur in specific systems where the population of energy states is inverted, allowing for a state of negative temperature. This phenomenon is not about being colder than absolute zero but rather represents a unique thermodynamic condition. The discussion references a recent scientific paper that explores the implications and mechanisms behind negative Kelvin. Understanding this concept requires a grasp of statistical mechanics and the behavior of certain quantum systems. The topic is complex but highlights fascinating aspects of thermodynamics and energy distribution.
I am following someone on Youtube who has built a rocket shaped (4 proprllers) drone for the world speed record ...
He was having problems with internal heat from electical control gear and battery inside the sealed rocket (about 1kw waste heat)
Speed is 500km/hr , I suggested a 4mm hole in the tip of the nose and 8mm hole at rear which should alow sufficient air cooling ..
I said this will increase thrust because the air exiting is hotter .. a bit similar to a ram jet ... was I correct...
Quick question that I haven't been able to find the answer to. Greenhouse gasses both warm and cool the atmosphere by slowing heat loss to space. But what would happen without GHGs?
I read that the earth would be colder (though still relatively warm), but why? Without GHGs the atmosphere would still be a similar mass and still warmed by conduction from the surface, yet without a means to radiate that heat to space.
Why wouldn't the atmosphere accumulate heat over time, becoming warmer? How...
Do we even know? My understanding of dark energy is that particles come into existence, exert and outward force, then vanish. My problem with that is how, of course, then how does dark energy know to push everything in the same direction? The pressure exerted would be in all directions, even if the space was moving so why isn't stuff pushed all over the sky?
Thanks - rev