massExcess

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: massExcess

Indicates the amount by which an actual mass exceeds a reference or expected mass, typically relative to a standard such as the sum of constituent parts or a nominal value.