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The study of the large-scale structure, history, and future of the universe. Cosmology is about asking and answering questions about the "big picture" - the extent, origin, and fate of everything we know.
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On the thermal velocity of gas (or any other particles)
The thermal velocity you're referring to is the root mean square velocity. It arises using ideal gas law equations. The first equation is a calculation of the pressure exerted on the walls of a contai …