Daily Archive: October 10, 2019

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Invention of Thermometer

Thermometers are made of thin glass tubes. The lower end of the pipe is bulged, filled with alcohol or mercury. The air in the elongated section with the streaks is discharged, then its mouth...

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Invention of the Wheel

For a long time I have been in the discomfort and unhappiness of the rapid disappearance of nature. Today, I believe that the inventions and insatiable consumption ambition of human beings are preparing our...

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Bohr quantum postulates

Bohr quantum postulates Bohr’s quantum postulates are two basic assumptions introduced by N. Bohr to explain the atom’s stability and spectral laws (within the framework of the Rutherford atom model). The planetar model of...

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Doppler effect

Doppler effect The Doppler effect is the change in the frequency of the waves or the wavelength l, which is perceived by the observer when driving the source of the oscillation and the observer...