How do I unstick glass containers?

https://www.youtube.com/watch?v=HOglOnne3As

https://lifehacker.com/5975688/the-fastest-way-to-separate-stuck-glasses

Fill the top glass with a little ice, and then put the bottom glass into a sink or bowl of warm water. Give it a second or two to work, and the difference in temperatures between the two will cause the bottom one to expand a little and the top one to contract a little.

Cooked up,. Put them in hot water. Fill the top one with hot water, this should make the rim of the bottom one expand. Aloha!

Mogie gave the right suggestion. You want to expand the bottom piece and contract the inner stuck piece. I put the lower one in hot water for a bit, then fill the top one with ice water or have a bowl of ice water and put the top of the stuck one into the ice water, but not so that it will cool down the bottom piece.

• Heat the outer glass. This method carries some risk, so you should use it with care. Since the outer glass is the one that has shrunk around the inner glass, this one needs to expand to allow the inner glass to slip away. Gently heat the outer glass by running it under the hot tap for a minute or so. With any luck, the glasses should come unstuck. If not, you may wish to consider cooling the inner glass, by filling it from the cold tap. [2] Avoid using ice or boiling water. The sudden change in temperature could cause one or both glasses to shatter violently, which could be very dangerous. [3] The glass is already under compression, making the situation especially risky.