+The **First Law** establishes a foundational principle of [Conservation](/wiki/Conservation) within a system. It states that a specific quantity cannot be created or destroyed, only transformed. This timeless rule underpins much of [Physics](/wiki/Physics).
+## See also
+- [Thermodynamics](/wiki/Thermodynamics)
+- [Energy](/wiki/Energy)
+- [Second Law](/wiki/Second_Law)