system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is cold water from the sink clear, while very hot water from the sink is cloudy white?
gpt
Unlike solids and liquids, gas has an inverse relationship between solubility in water and temperature of the water. This means the warmer the water, the LESS gas it can absorb! The water is entering your hot water tank cold, then being heated under pressure, preventing any dissolved gasses from escaping (yeah, your hot water tank is kind of a pressurized bomb, but anyhoo). The water is kept under pressure until it finally emerges from your tap, where it encounters an aerator, designed to introduce even more gas into the water. So, predictably, the gas comes out of solution quickly, causing the bubble you see!