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SAO/NASA Astrophysics Data System (ADS) is a Digital Library portal for researchers in Astronomy and Physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant. The ADS maintains three databases containing nearly 9 million records: Astronomy and Astrophysics, Physics, and arXiv e-prints.
This physics center is full of very useful resources organized by topic and type, including courses, e-journals, manuals, videos, movies, calculators, and an exhaustive collection of high quality physics links to almost anything a physicist could want.
CFD Online is an independent online center for Computational Fluid Dynamics. It includes discussion forums, jobs database, free CFD reference Wiki, news & announcement forum, books guide, events calendar, and a comprehensive section with pointers to CFD resources. CFD Online's goal is to offer high-quality web services to the CFD community. The site is independent; it is not associated with any vendor or company.
The speed of sound in air depends on the type of gas and the temperature of the gas. Scientists and engineers have created a mathematical model of the atmosphere to help them account for the changing effects of temperature with altitude.
This provides access to educational materials and resources, including information about NASA, news, and current projects. It includes a link to the NASA's Education Materials Finder to help teachers locate hundreds of resources that can be used in the classroom.