On 22/04/2020 09:17, Robin wrote:
On 22/04/2020 08:16, harry wrote:

They fail due to the air/gas inside heating up and expanding.
Bigger gaps have more air & therefore subjected to higher pressure.


Gay-Lussac's law: the pressure changes the same with temperature
independent of the volume.Â* Bigger gaps means more gas but also more
volume.




As I recall, Gay-Lussac's Law applies to an ideal gas. Chances an sealed
unit has (at least) some water vapour in it and isn't therefore an ideal
gas. The better ones are often filled with some inert gas when new, or
at least dry air. However, if the the seal has failed, chances are water
/ water vapour had got in and a this is causing the problem. (Water
vapour is a polarised molecule and that stops it being an ideal gas, if
I remember my Physics.)

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