The state of being so engrossed in one's device (
iPhone, iPad or equivalent) that one remains oblivious to all surrounding activity and communication and to the social norms that once governed them. Accordingly, the Law of iNertia states that a person engaged with his or her device will remain so engaged, regardless of any forces acting upon them to achieve a
change of state. (The Law of iNertia
thus operates contrary to the Law of Inertia, according to which a body at rest will remain at rest and a body in
motion will continue moving with a constant velocity unless acted upon by an external non zero force.)