Physics is what you understand. Marine physics is an information technology related to ocean observation and cognition, such as ocean exploration, satellite ocean remote sensing, ocean optics, ocean acoustics and ocean sensors. Physical ocean is the study of ocean currents, waves and tides, seawater material transport, ocean circulation, tides, internal waves, storm surges and ocean-atmosphere interactions, which are all physical phenomena directly related to the ocean and have a great relationship with fluid mechanics.