The results: The hand configuration that produced the loudest clap—85.2 dB—consisted of holding the hands 45 degrees to each other with the palms partially overlapping.

Psalm 47, for example, says, "Clap your hands, all you peoples. Shout to God with the voice of triumph." On the other hand, gloomy old Jeremiah says, "All who pass by clap their hands at you; ...