Cream chargers are small canisters crammed with nitrous oxide

https://syd1.digitaloceanspaces.com/creamchargers/australia/uncategorized/the-science-behind-huge-cream-chargers-a-complete-guide.html

Cream chargers are small canisters jam-packed with nitrous oxide, used to whip cream in a timely fashion and create fluffy toppings for desserts and liquids.