Cream chargers are not only for whipped cream; they may additionally be used to create espuma or foams

https://mill-wiki.win/index.php/From_Novice_to_Pro:_Mastering_the_Use_of_Nitrous_Oxide_Cream_Chargers

Cream chargers are usually not only for whipped cream; they too can be used to create espuma or foams, adding a distinct twist on your dishes.