Back ثابت (فيزياء) Arabic Invariant (física) Catalan Invariante (física) Spanish اصل ناوردایی Persian Invarijantnost Croatian Ինվարիանտություն Armenian Invarian (fisika) ID Invarianza (fisica) Italian 不変量 (物理学) Japanese Инварианттылық Kazakh
In theoretical physics, an invariant is an observable of a physical system which remains unchanged under some transformation. Invariance, as a broader term, also applies to the no change of form of physical laws under a transformation, and is closer in scope to the mathematical definition. Invariants of a system are deeply tied to the symmetries imposed by its environment. Invariance is an important concept in modern theoretical physics, and many theories are expressed in terms of their symmetries and invariants.