Does divorce take effect by merely moving the tongue without moving the lips or opening the mouth, especially when there is no intention of divorce, but rather it is just an experiment?

If you utter a clear divorce pronouncement, such as "You are divorced" or "I divorce you," the divorce takes effect even if you did not intend it. Seriousness and jest are treated the same in matters of divorce. However, if you use an ambiguous term (kinayah) for divorce and did not intend divorce, then no divorce occurs.