# Difference between revisions of "Dictionary:Z/A/en"

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{{#category_index:Z|''Z/A''}} | {{#category_index:Z|''Z/A''}} | ||

The ratio of atomic number ''Z'' to atomic weight ''A'' and, hence, proportional to the ratio of electron density (as measured by the density log) to mass density. <b>Apparent density</b> equals true density where ''Z''/''A''=1/2, which is closely approximated for many minerals (e.g., quartz, calcite, anhydrite, dolomite). The apparent density is larger than the true density when ''Z''/''A''>1/2 (e.g., gypsum, oil, 110% for water), smaller when ''Z''/''A''<1/2 (e.g., salt). | The ratio of atomic number ''Z'' to atomic weight ''A'' and, hence, proportional to the ratio of electron density (as measured by the density log) to mass density. <b>Apparent density</b> equals true density where ''Z''/''A''=1/2, which is closely approximated for many minerals (e.g., quartz, calcite, anhydrite, dolomite). The apparent density is larger than the true density when ''Z''/''A''>1/2 (e.g., gypsum, oil, 110% for water), smaller when ''Z''/''A''<1/2 (e.g., salt). |

## Latest revision as of 11:09, 16 March 2020

The ratio of atomic number *Z* to atomic weight *A* and, hence, proportional to the ratio of electron density (as measured by the density log) to mass density. **Apparent density** equals true density where *Z*/*A*=1/2, which is closely approximated for many minerals (e.g., quartz, calcite, anhydrite, dolomite). The apparent density is larger than the true density when *Z*/*A*>1/2 (e.g., gypsum, oil, 110% for water), smaller when *Z*/*A*<1/2 (e.g., salt).