boyls law with coffee cup Stirling engine.

[sushil_dagur]

Sir
Hare i am in big trouble, that how can i explain boyls law with
coffee cup Stirling engine? Because i amthinking that it is not
possible to have constant temperature, we have to provide a
temperature difference to our model, otherwise it is not going to
work.
so please hepl me out.
thanking u.