What should be used to thaw cylinders that are frozen?

Using warm water is the appropriate method for thawing frozen cylinders. This approach helps to gradually raise the temperature of the cylinder without causing thermal shock or damage that could occur with more extreme temperatures, such as boiling water. Warm water provides a controlled and steady heat source, which is effective and safe for thawing the contents of the cylinder.

Boiling water, on the other hand, could lead to rapid temperature changes, potentially compromising the integrity of the cylinder or its contents. Ice melts might not provide sufficient heat to effectively thaw the cylinder, particularly in a timely manner. Utilizing compressed air may seem like a quick solution, but it could also introduce risks by causing uneven heating or pressure changes that could be hazardous. Thus, warm water is the most balanced and safest option for thawing frozen cylinders effectively.