I have a glass of water at room temperature. The electromagnetic force is at play between the electrons and nucleus of the atoms, the strong nuclear force is at play holding the nucleus together, the force of gravity weak as it may be is at play between the various particles - electrons, quarks. Is the weak nuclear force at play as well? Are neutrons being converted into protons in this glass as is the case with the weak nuclear force be it in a very minimal way/not frequent but still happening? Or is the case that the weak nuclear force only manifests itself in special circumstances such as radioactive materials, extremely high temperature/high energy situations - sun, accelerators? From my reading it seems to only occur to free standing neutrons - not those bound in a nucleus - which I assume to be a special circumstance/special environmental situation - and which is not the case with my glass of water at room temperature. Thanks in advance for clarification on this point.