system
Given the following post, respond as if you're commenting on Reddit:
human
Why when i fill up my glass with very hot water from the tap it looks cloudy for a few seconds before turning clearer, whereas water from the tap that's cold is clear from the start?
gpt
Hot water dissolves ~~more~~ less gases than cold water. This is also dependent on pressure, where gases stay dissolved at higher pressure, and come out of solution at lower. So if the water starts cold with dissolved gases, and then is heated up and the pressure reduced, those gases come out of solution as bubbles. 

If you're in the right range of temperatures and dissolved gas concentration, the pressure drop upon exiting the tap, can allow the gases to come out of solution as bubbles.  

This all depends on how much gas is there to begin with. You wouldn't see any bubbles if there were no dissolved gases to start.