instantaneous : Idioms & Phrases
Instantaneous axis of rotation
(Kinematics) , in a body which has motions both of translation and rotation, is a line, which is supposed to be rigidly united with the body, and which for the instant is at rest. The motion of the body is for the instant simply that of rotation about the instantaneous axis.
Webster 1913
Instantaneous center of rotation
(Kinematics) , in a plane or in a plane figure which has motions both of translation and of rotation in the plane, is the point which for the instant is at rest.
Webster 1913
instantaneous sound pressure
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noun the difference between the instantaneous pressure at a point in a sound field and the average pressure at that point
sound pressure.