everyday life - How big are clouds? - Physics Stack Exchange
2015年9月18日 · Cloud particles can be a few dozens of micrometres, and big tropical cyclones can be thousands of kms across. That's a range of more than 10 orders of magnitude! That's why clouds are a pain to represent in models — it is simply impossible to have a physics-based model of a cloud with a domain large enough to represent a full cloud system.
How would one calculate the amount of water contained in a cloud?
A practical way to guess the maximum height of the cloud is to make observations of its appearance and then classify the cloud by qualitative type. Much has been learned and documented about the physical characteristics of the qualitative cloud classes through observational meterology. Before cloud-physics, there was the natural-science of clouds.
Why do rain droplets differ so "much" in size?
$\begingroup$ @descheleschilder - either low altitude, or low cloud thickness. In other words - from the point where rain is generated, it doesn't pass through a lot of other droplets. Incidentally - once you get past a certain size, big rain drops can become unstable and …
How is it possible that we see light from shortly after the big bang?
2012年5月8日 · Thus the light the astronomers see from the Big Bang, the cosmic microwave background radiation is the light coming from everywhere on our point on this surface. We hypothesize a time 0 for light coming to us because we see how cold the photons are, and calculate the red shift from the initial hot production of all those photons.
particle physics - Is the nucleus smaller than the electron?
2020年11月2日 · The question confuses the electron "cloud", which is really the probability for where an electron may be found, with the size of an electron. The electron is sizeless, which can either be taken to mean that it has zero size, or that size in the quantum domain is a meaningless quantity, depending on how one chooses to think of it.
Cloud chamber temperature - Physics Stack Exchange
Yoshinaga, K., Kubota, M., & Kamata, M. (2014). Simple cloud chambers using a freezing mixture of ice and cooking salt. Physics Education, 50, 23-27. I am not in a position to comment about the underlying physics and probably cloud chambers with lower bottom temperatures work better.
How much and what kind of sunlight passes through a cloud?
2016年7月5日 · Now there a small clouds and big clouds so it should be some average. Is this true or is the amount of sunlight passing throug a cloud really much more depending on the size of clouds. Is it for instance on a totally cloudy day that only 30% is passing and on a nice summerday when a cloud comes by it is 90%.
cosmology - How does the ratio of hydrogen to helium help prove …
2019年6月3日 · Definitely a "big bang". In contrast, in the official Friedmann model (a.k.a. "FLRW") with a flat space per the latest measurements, the universe has always been infinite and all filled with matter from the start. Is this one a "big bang"? Perhaps, but not nearly the same. So the "big bang" is a common principle, not a theory. $\endgroup$ –
What is in the space between a nucleus of an atom and its electrons?
Maybe one should add to the analysis of @QEntanglement and the nice electron probability clouds in the illustrations in the other answers, that also the space between the nucleus and the electrons is teaming with the exchange of virtual particles between the electrons and the nucleus, necessary to create the potential which determines the energy levels of the particles.
How does nuclear war look like from space? - Physics Stack …
After a few weeks at most, the clouds would dissipate (screw you Carl Sagan and your self-lofting cloud.) An observer from the moon would see vast areas of grey and black from vast fires that covered millions of acres. Many would still be burning as plants dying of radiation from fallout dry out and catch fire.