Free radical意思

"Free radical" is a term used in chemistry to describe a molecule or atom that has an unpaired electron in its outer shell. This makes them highly reactive, as they are unstable and seek to stabilize themselves by pairing up with other electrons. This reactivity can cause damage to cells and is thought to be a contributing factor to the aging process and the development of certain diseases, such as cancer and heart disease.

Free radicals can be formed naturally in the body during normal metabolic processes, or they can be introduced from external sources, such as pollution, cigarette smoke, and UV radiation. To combat the effects of free radicals, the body produces antioxidants, which can neutralize them and prevent them from causing damage.

In popular usage, the term "free radical" may also be used metaphorically to refer to something that is novel, unconventional, or unorthodox.