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Documenting that expandTo conserves mass not number of atoms #2645

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john-science merged 1 commit into from
Aug 28, 2026
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Documenting that expandTo conserves mass not number of atoms #2645

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8 changes: 3 additions & 5 deletions doc/user/inputs.rst
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Expand Up @@ -1292,12 +1292,10 @@ you start changing which nuclides are modeled and which ones deplete.::
The code will crash if materials used in :ref:`blocks-and-components` contain nuclides not defined in ``nuclide flags``.
A failure can also occur if the burn chain is missing a nuclide.

.. tip::
We plan to upgrade the default behavior of this to inherit from all defined materials in a problem to reduce the
user-input burden.
.. note::
If you use the ``expandTo`` feature, ARMI will conserve the total mass, but not the total number of atoms.

.. These following are rst substitutions. They're useful for keeping the plaintext readable while getting subscripted
text.
.. These following are RST substitutions. They're useful for keeping the plain text readable.

.. |Tinput| replace:: T\ :sub:`input`
.. |Thot| replace:: T\ :sub:`hot`
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