Foam
Bubble
noun
Water bubbles are bubbles that come from the water. This is usually in the form of foam, but could also be a bubble.
水泡 is a literary word, mainly seen in the idiom 水泡に帰す (to come to nothing). This phrase paints a picture of your efforts going down the drain, turning into foam or bubbles in the water, and ultimately disappearing into nothingness.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
データを保存する前にブラウザがクラッシュしてしまったため、長文のメッセージを書いていた努力が水泡に帰してしまった。
My browser crashed before I saved my data so my efforts to write a long message ended in failure.