John Henry Poynting (1852-1914) is known for his work related to the determination of the effect of pressure on the changes of phase and osmotic pressure (the Poynting effect), the determination of the constant of gravity and the mean density of the Earth¡ the pressure exerted by radiation, the transfer of energy in an electromagnetic field¡ and the connection between electric current and the electric and magnetic inductions in the surrounding field (the Poynting vector).
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