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Generally, blind persons usually dont know water level when they refill drinks. By applying a Physics principle of Resonance, an innovative structure of the cup could solve the problem successfully. When holding water, water will hit the bottom of the cup initially. As well as the water level get higher, the frequency of sound will get higher. When the water level pass through the narrowest position, the frequency of sound will reach the peak. After passing through the narrowest position, the frequency of sound will change dramatically. With the variation of sound, the blind persons could know the water level when they refill a cup.
National Cheng Kung University
Student of NCKU in Taiwan