# Adiabatic pendulum


In physics quantities _which change little under slow changes of parameter, are called adiabatic invariants_([1](#fn1)). The pendulum could be an adiabatic invariants. To get it, as well as to get any of the adiabatic invariants, _the person changing the parameters of the system must not see what state the system is in_([1](#fn1)).

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1743070748321/79393cbb-3bcf-48bb-b357-764a5015d882.jpeg)

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1.  [V. I. Arnold](https://en.wikipedia.org/wiki/Vladimir_Arnold), _Mathematical Methods of Classical Mechanics_, Springer-Verlag (1989) [↩](#fnref1) [↩](#fnref1:1)