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Showing posts from December, 2019

Explanation on special relativity

Worm hole [1] The speed of light always is ‘c’, no matter where we are (either on the moving body or on any rest ‘ground’). This is one of the two fundamental assumptions based on which Einstein’s special theory of relativity stands. This is, as a matter of fact, the result of experiment, not imagination or assumption of Einstein, Feynman, or anybody else. The famous experiment is called Michelson-Morley experiment, the details of which can be found in Wikipedia. The basic idea of this experiment is: assuming the speed of light ‘c’ is specifically relative to something (historically, the ‘something’ here was called aether, from what I remember), then we know our earth is rotating around the self-axis, thus the speed of light, of course, is NOT ‘c’, if our previous assumption (‘c’ is specifically relative to aether) stands. Then using the facility designed by Michelson and Morley, we should observe some corresponding effect, which is the result of the changing of speed of light rel

Silent refrigerator – The working principle of Einstein’s refrigerator

All refrigerators running with gas relies on the principle that the evaporation of liquid to its corresponding gas form will take heat from surroundings. After evaporation, the gas should be liquefied back to liquid form to finish the cycle, and of course, the process of liquefaction will emit heat. That’s why need a fan (that’s just where the noise come from, which is also we want to diminish or even remove) for the commonly used gas-compression-based refrigerator to bring that part of emitted heat to the surrounding environment to keep it cool inside the refrigerator. The so-called absorption refrigerator, as one kind of gas-based refrigerator, also work on the evaporation and liquefaction of gas as mentioned above. But the difference here is that it does not bring the evaporated gas to its liquid form through compression. Instead, the evaporated gas will be solved (i.e. absorbed, thus comes the name ‘absorption refrigerator’) in some solvent, which then finish the cooling-and-heati