system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is cold water more thirst quenching then warm water?
gpt
The blood vessels around the roof and base of your mouth, and the lining of your esophagus,  are extremely thin and sensitive compared to most parts of your body, making it very susceptible to temperature. When you take a mouthful of cold water, the cold water rapidly cools off the blood passing through the vessels around your mouth and throat, and that cooled blood then circulates throughout the rest of your body.

This process provides a faint cooling sensation to your whole body, not just your mouth.  Thus a cold glass of water seems more "refreshing." Although it may cool you off a little, you actually digest warm water faster than cold water. Thus, if you are suffering from dehydration and have not have a drink in several hours, warm water will actually help your system recover faster.