expansivity

nouns

the fractional change in length or area or volume per unit change in temperature at a given constant pressure
coefficient of expansion, expansivity
a quality characterized by magnificence of scale or the tendency to expand
"the expansiveness of their extravagant life style was soon curtailed"
expansiveness, expansivity
is derived from
expansive
a friendly open trait of a talkative person
effusiveness, expansiveness, expansivity
is derived from
expansive