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Kinetic Theory of Heat Kinetic Theory of Gases Size
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alpha particles atomic number atomic structure atomic weight beta beta particles billionth black-body Bohr celestial bodies century chemical considered consist constant developed diameter discovered distance Earth Einstein elec electric charges electromagnetic mass electromagnetic waves electron theory emission emitted equal ether exist experimental experiments fact force foundation gravitation heat helium helium atom hydrogen atom idea ions kinetic energy knowledge known light-waves magnetic field magnitude mass mathematical matter Maxwell's mechanical ments million molecules motion moving natural Newton's laws nucleus observer orbit oxygen period phenomena photoelectric effect physical world picture Planck planets positive electricity pressure principle of relativity produced properties protons quantum of energy quantum theory radiant energy radioactive elements radium result revealed revolving Rontgen rays space spectral lines spectrum stars stellar substances temperature termed theory of atomic thorium tion ultraviolet radiation universe uranium various velocity of light wave-theory wavelengths wavelengths or frequencies