Quote:
Originally posted by squidlips
2. How To Open A Jar
Usualy a towel will suffice however if it is still stuborn run boiling hot water over the jar then cold water, and resort to the towel again. It has to do with the difference in coefficients of expantions.
Good way to shatter a glass jar; rapidly cooling an object that has been heated to a high degree can often cause cracking (or, with glass, shattering). Ancient civilizations used to build large fires at the base of rocks then dose them with cold water to crack them apart so they could be moved.