reactivity
n. C1 Advanced US //ˌɹiˌækˈtɪvəti// UK //ɹɪɐktˈɪvɪti// re·ac·tiv·i·ty
n. the ability of a substance to react with another substance to create a new one. It describes how quickly or easily a chemical change happens.
n. the tendency of a substance to undergo a chemical reaction with another substance. Often used to describe the sensitivity of a material to external stimuli such as heat, light, or pressure.
The reactivity of the metal increases when it is exposed to air.
Chemists carefully measure the reactivity of different compounds to ensure the reaction remains controlled and safe.
The high reactivity of the alkali metals necessitates their storage in an inert atmosphere to prevent spontaneous combustion upon contact with moisture.
From reactive + -ity.