standardAtomicWeight

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: standardAtomicWeight

Indicates the conventional average mass of atoms of an element in a specified sample, typically reflecting the weighted mean of its naturally occurring isotopes.