Thread: Ask a Scientist
View Single Post
  #43  
Old 19.10.2007, 15:23
JVC
 
Posts: n/a
Re: Ask a Scientist

Quote:
View Post
1) From the 'adding salt to boiling water for pasta cooking' discussion, am I right to think that the town council workers put salt on snowy/icy streets to raise the melting point of ice/snow?
Putting salt on the roads lowers the freezing point of water. With the right amount of salt, the water stays liquid instead of freezing.

But it isn't entirely straightforward. Given the wrong temperature conditions, not enough salt can lower the freezing point just enough to make ice/snow melt during the day but freeze again at night, but now it's smooth sheet ice and very dangerous.
Reply With Quote