Bottle having water volume measuring function

A bottle having water volume measuring function comprising:

• a bottle-body with an opening;
• a bottle-lid disposed at the opening of the bottle-body and forming an enclosed space within the bottle-body;
• and
• a measure module, disposed in the bottle-lid toward the enclosed space, and comprising:
• a memory unit for storing a lookup table with corresponding relationships of a plurality of frequencies and a plurality of air column heights of the bottle-body;
• a sweeping frequency type sound wave transceiver unit for emitting sound waves with sweeping frequencies towards the bottle-body and receiving reflected waves, wherein the sweeping frequency type sound wave transceiver unit is disposed at a bottom of the measure module facing outward and is disposed at a center of the bottle-lid without contacting the bottle-body;
• and
• a micro controller unit electrically connected to the memory unit and the sweeping frequency type sound wave transceiver unit for determining if any frequency of the sound waves is an air-resonance frequency according to an energy level of each of the reflected waves, and obtaining the corresponding air column height by checking with the air-resonance frequency in the lookup table, and calculating a remained water volume in the bottle-body according to the obtained air column height, wherein the micro controller unit determines that one of the sound waves has the air-resonance frequency if the sound wave generates an air-resonance effect in the enclosed space.