Water Temperature

Humans can distinguish water temperature just by listening to the sound, not just by touch! If you listen closely to the sound of pouring warm and cold water into a cup or mug, you'll notice subtle differences🫨 This is because warm water has lower viscosity than cold water, causing the water molecules to move more actively😆 Cold or lukewarm water: Higher viscosity, resulting in a clear, high-pitched, and crisp sound when poured. Hot water: Lower viscosity, causing bubbles to break smaller and more foam to form, producing a lower, deeper, and softer sound. In fact, if you play only the sounds for people and ask them to guess "Which one is the hot water?", even ordinary people without special training can guess correctly with over 85% accuracy👍👍 Without even realizing it, we've spent our lives listening to the sound of pouring water and have accumulated the ability to judge water temperature by sound in our brains😁