英语词汇“atomic mass unit”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-新都网

atomic mass unit

(abbreviation amu)

noun

A unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.For example, carbon 12 has a mass of exactly 12 amu, but it is made up of six protons and 6 neutrons (1.0087 amu each)....

This standard was adopted internationally in 1961, replacing an arbitrarily assigned value of 16.000 amu for the atomic mass of an atom of oxygen.
First, neutrons and protons don't happen to weigh exactly one amu apiece; the proton actually weighs 1.0072765 amu and the neutron weighs 1.0086650 amu.

单词	atomic mass unit
释义	atomic mass unit (abbreviation amu) noun A unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.For example, carbon 12 has a mass of exactly 12 amu, but it is made up of six protons and 6 neutrons (1.0087 amu each).... This standard was adopted internationally in 1961, replacing an arbitrarily assigned value of 16.000 amu for the atomic mass of an atom of oxygen. First, neutrons and protons don't happen to weigh exactly one amu apiece; the proton actually weighs 1.0072765 amu and the neutron weighs 1.0086650 amu.
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