No, nangs refer to whipped cream chargers which are cylinders that contain nitrous oxide (N2O). Cylinders that contain CO2 are soda chargers and are used for making fizzy drinks soda water and lemonade etc…
Nangs are used for whipping cream as the nitrous oxide can dissolve in the cream fat under pressure of the whipped cream dispenser and then when the cream with dissolved nitrous oxide is released the nitrous oxide gas bubbles expand making the cream light and fluffy or whipped.
Nangs have other culinary purposes aside from whipping cream. They are also used as a foaming agent in sauces and mousses. They are also used as a flavor infusing agent for alcohol when making flavored alcoholic drinks (aka cocktails).