fine structure constant

The Fine-Structure Constant, often denoted as α (alpha), is a fundamental number in physics that measures the strength of electromagnetic interactions between charged particles, like electrons and protons. It is approximately equal to 1/137, and it fundamentally influences how atoms and light interact. A smaller or larger value of this constant would significantly alter the structure of matter and the universe itself. This dimensionless constant is crucial for understanding the behavior of particles in quantum mechanics and plays a vital role in the laws of nature that govern the universe.