Definition:Physical Constant

Definition
A physical constant is a physical quantity that is believed to be unchanging in both space and time.

Also known as
A physical constant is also known as a fundamental constant of nature, or just fundamental constant.

Also see

 * A Definition:Constant in the context of mathematics, which is a fixed abstract number.


 * Definition:Constant (Physics): as an adjective, describes a physical quantity which does not change with time over the course of a particular analysis.