Science question: I live in the south east U.S. We don't usually have sub freezing temperatures, however when we do, the local news always says to disconnect external water hoses to prevent waterpipes from bursting.
I'm trying to understand if there is any true science to back up this claim. Why would the water hose itself have any affect on pipes bursting? Wouldn't it only occur if water freezes between the faucet and the pipes and expands and cracks the pipes? The hose connected doesn't seem relevant.
Any science to back this up?