"Water surface" refers to the topmost layer or outermost part of a body of water, such as a lake, pond, or ocean. It is the area where the water is exposed to the air and where things like waves, ripples, or reflections can be seen. Full definition
In the case of water surfaces, the transfer is by convection and may consequently be affected by the horizontal transport of heat within large bodies of water. (britannica.com)
It is developed for investigation on 2D motion control and motion planning in a small place, and it can only swim at water surface. (sciencedaily.com)
The racer puts players on futuristic tracks set on dynamic water surfaces that are touted as being «fully interactive» in single - player and up to six - player multiplayer. (xblafans.com)