# packing fraction

- Physics. a measure of the stability of an atomic nucleus, equal to 104 multiplied by the mass defect and divided by the mass number.

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## Origin of packing fraction^{}

First recorded in 1925–30

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## packing fraction

- a measure of the stability of a nucleus, equal to the difference between its mass in amu and its mass number, divided by the mass number

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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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## packing fraction

[păk′ĭng]

- The ratio of the total volume of a set of objects packed into a space to the volume of that space.
- The difference between the isotopic mass of a nuclide and its mass number, divided by its mass number. The packing fraction is often interpreted as a measure of the stability of the nucleus.

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The American Heritage® Science Dictionary
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