stability - what's an example of a physical system that is not robustly stable? -

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i'm having problems figuring out system it's stable values of physical properties unstable others.

even basic example lot, dimension 2 totally fine.

i not have problems figuring out mathematically robust stability means, can't find physical example.

actually i'm looking more system has finite robust stability margin. outside references too, in advance.

it depends meant "stable". pot of water @ room temperature "stable" in water in liquid form. if boil water, becomes "unstable" because water in flux between liquid , gaseous form. physical property in flux temperature. keep temperature constant , vary air pressure if system. drop air pressure low enough , water begins boil.

a stable property of same system salinity. doesn't mater how salt add, it's not going change water gaseous form. again, depends on mean "stable".


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