Physical oceanography is the study of physical conditions and physical processes within the ocean, especially the motions and physical properties of the ocean. This is usually further divided into the activities of descriptive and theoretical oceanography, the former being concerned with observing the oceans to prepare maps of the spatial and temporal variations of its properties, and the latter with constructing theoretical models to attempt to explain the observations. As in most natural sciences, most significant advances are the result of the interaction between theory and observation. Physical oceanography is not a pure science but rather an applied science in which the knowledge of many disciplines is relevant (e.g. fluid mechanics, optics (optical oceanography), acoustics (acoustical oceanography), thermodynamics, and especially in the age of satellites, electromagnetics (satellite oceanography). This is one of four sub-fields into which the general field of oceanography has been divided, the others being biological. chemical, and geological oceanography.
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