bubbliness (of a carbonated drink); sound of bubbles (of a carbonated drink); fluffiness (of a cake, souffle, whipped cream)
しゅわしゅわの炭酸水を飲んだ。
I drank fizzy carbonated water.
サイダーがしゅわしゅわと泡立つ。
The cider is fizzing.
しゅわしゅわのパンケーキが人気だ。
Fluffy pancakes are popular.