Pyrex Dishes stuck together

[ML5]

I have 2 Pyrex Dishes that are completely stuck together - tried hot water but they still stuck. Anyone have any idea/s how I can get them unstuck? They the Pyrex Dishes you make Pasta Bakes in

Can you sit the bottom one in very hot water and put very cold water in the upper one?

Put the bottom one in hot water and fill the top one with ice?

How long would I leave them like this for

My thoughts are they have vacuum sealed themselves together. Try putting them back in a bowl of hot water and trying to insert a thin blade between the rims to try to prise them apart fractionally, and get water in between them to break the seal. But if it's a sharpe blade, obviously be careful.

Thank you

I think the heat and cold are the thing. The cold will make the inside one shrink. The hot water will make the outside one expand. It won't take much of that until they are no longer stuck to each other.

If it's easier you could bung both in the freezer overnight and then take them out and put the bottom one in hot water. That should do it too, assuming that they don't shatter, which might be a possibility.

Bizarrely, I seem to remember from school, that the reason why Pyrex glass can sustain heat is that it transfers the heat through the glass very quickly and efficiently.
So put them in a bowl of hot water and some cold water with ice cubes in the top bowl - but don't leave it too long - just a few minutes.
If it works, it means my education wasn't a complete waste of time. Regardless of what my teachers said...

Both in the oven, with water in the top one?

Whack them firmly against a wooden chopping board: usually does the trick for me.

Be careful. Dh took a glass pan lid from the fridge into the washing up bowl and the lid smashed and the knob flew off!

Gently knock them on the side to try and loosen one of them?

Tap them lightly against the work surface to break the seal?

Snap! We have a couple of bowls that frequently get stuck together and this is what I do.

Olive oil?

Or any kind of oil, come to that!

Agree with this, a percussive shock may well do the trick.

Works well with stuck jar lids too

After you’ve separated them, put them away with a piece of kitchen towel inbetween them to stop them doing it again.

Will the hot cold method work with no ice cubes or can I use normal cold water in top Pyrex dish