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单词 esu
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esu
esu n. Physics (now disused) electrostatic unit(s), a unit of charge used in the centimetre-gramme-second system, equal to the charge two objects that are one centimetre apart must possess in order to repel each other with a force of one dyne.Although not compatible with SI Units, the electrostatic unit of charge is generally considered to correspond to approximately 3.34 × 10−10 Coulombs.
ΚΠ
1911 Proc. Royal Soc. A. 85 170 e being..the atomic charge, e.s.u.
1958 E. U. Condon & H. Odishaw Handbk. Physics a 9/2 The cgs unit of charge is called the esu or the statcoulomb.
2016 M. Andrews & N. Yu in A. Godley & P. Xia Physics in Radiation Oncology iv. 88 The original unit [sc. the roentgen] was defined as the amount of radiation that liberates 1 esu (electrostatic unit) of charge per cubic centimeter of air.
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