Quantum mechanics is often associated with randomness due to the probabilistic nature of its predictions. According to the Copenhagen interpretation, which is one of the widely accepted interpretations of quantum mechanics, the behavior of quantum systems is inherently probabilistic until they are measured or observed. This probabilistic behavior is captured by the mathematical formalism of quantum mechanics, which uses wavefunctions and their associated probabilities to describe the state of a quantum system.
However, it's important to note that the concept of "randomness" can be interpreted in different ways. In the context of quantum mechanics, randomness refers to the inherent uncertainty in the outcomes of certain measurements or observations. It implies that, for some physical quantities, we can only predict probabilities of obtaining different results rather than precise values.
Outside the realm of quantum mechanics, whether there are other truly random phenomena in the universe is still a topic of scientific investigation and philosophical debate. There are several areas in which randomness is considered, such as chaotic systems, certain aspects of thermodynamics, and quantum field theory. However, it's worth noting that our understanding of the universe is continually evolving, and new discoveries may provide deeper insights into the nature of randomness in different domains.
Ultimately, whether quantum mechanics is the only truly random thing in the universe or if there are other fundamental sources of randomness is an open question that continues to be explored by scientists and philosophers.