Refraction. The interface of water and air bends the light, which gives you a different perspective.
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Ways that make you appear shorter is slouching, slouching will make you appear shorter so if you stand straiter you will appear taller
No
Theoretically if you are taller on average your legs will be longer on average and vice versa if you are shorter. Also but still theoretically if you move longer legs and shorter legs at the same time with the force to scale longer legs will travel more distance in less time than shorter legs. However this is not completely true if you account for the fitness of the person or the fact that the legs will not be moved with a to scale amount of force.
The table's length. The height of your legs. The deepness of the water in a bathtub.
7 ft is way shorter