expansivity

Meaning

noun

1. the fractional change in length or area or volume per unit change in temperature at a given constant pressure
2. a quality characterized by magnificence of scale or the tendency to expand
   “the expansiveness of their extravagant life style was soon curtailed”
3. a friendly open trait of a talkative person

Synonyms for expansivity

• coefficient of expansion
• expansiveness
• effusiveness