Answer :
A glass flask containing 100 millilitres of water is sealed with a rubber stopper and placed on a burner. after a while, the gas condenses on the inside surface of the flask near the stopper this type of system is an example of a closed system
A thermodynamic system is defined as the amount of matter which is confined by walls of a medium that is of interest to the observer. Anything that is beyond the system is referred to as surrounding. A closed system is defined as a thermodynamic system which does not allow the transfer of matter between the system and its surroundings.
To know more about a closed system, refer here
brainly.com/question/14782983
#SPJ4