bubble; air bubble
Typically refers to bubbles in a liquid, but can also be used for gas pockets in solids or other media. Common in scientific and everyday descriptions.
水の中に小さな気泡がたくさん見える。
Many small bubbles can be seen in the water.
A small bubble had formed inside the glass.
This glass contains air bubbles.
接着剤の中に気泡が入ってしまった。
A bubble got trapped in the adhesive.
This concrete contains a lot of air bubbles.
After a while, the bubbles disappeared.
気泡 is a more technical term for an air/gas bubble, whereas バブル is the general katakana word that can also refer to bubbles in casual or product contexts.
水泡 looks similar and can mean a bubble of water, but it is mostly used figuratively (as in 水泡に帰す, 'to come to nothing'), unlike the literal, physical 気泡.
counter for small objects; counter for pieces · counter for military units · individual; one person · counter for years of age difference; counter for school years
Compound of 気 (gas, air) and 泡 (bubble). The reading is on'yomi for both characters.