K

Potassium (K) is a soft, highly reactive alkali metal notable for its low density and high chemical reactivity with moisture and oxygen. While rarely used as a structural material in its pure form due to these reactivity constraints, potassium finds specialized industrial applications in heat transfer systems, organic synthesis, and as a reducing agent in metallurgical processes. Engineers select potassium primarily for thermal management in liquid-metal cooling systems and in chemical manufacturing where its reactivity is an asset rather than a liability.