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Stress from nuclear mass and atomic distance (8)

Ross

I believe the answer is:

angstrom

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This clue might be a double definition.

'stress from nuclear mass' is the first definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'atomic distance' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'and' is the link.

Can you help me to learn more?

(Other definitions for angstrom that I've seen before include "Unit of wavelength measurement" , "0.0001 micron" , "virtually no distance!" , "Tiny unit of length used in Physics" , "Unit in which light wavelengths are measured" .)

I've seen this clue in the Sydney Morning Herald.
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