system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is cold water so effective at getting rid of suds?
gpt
Suds, or bubbles, in water are a result of decreased surface tension.

As the Surface Tension increases, the Surface Area is caused to decrease. Bubbles on the surface are a surfeit of surface area, compared to the flat surface of your non-soapy filled sink, so they exist at a much reduced tension.

It turns out, as water heats up, it's surface tension goes down. If you floated the largest sewing needle you could, on top of water in a pot, and heated it, it would fall in before the water boils. You could use a thermometer and over several attempts, the temperature when it falls in should be pretty close to the same every time.

Conversely, the cold water has higher surface tension and is better at pulling back the bubbles.