bubble

1. Origins, structure, and basic meaning

• Structure: 泡 has 8 strokes and denotes foam in liquids or bubbles of trapped gas.
• Basic usage: 泡 is read あわ, and 気泡 is read きほう.

2. Common pitfalls and similar expressions

• Foam forming
  • 白い泡が立ちました means that white foam formed.
• Where bubbles occur
  • ガラスの中に小さな気泡が残っていた means that small bubbles remained inside glass.
  • 気泡 is not limited to bubbles floating on the surface of water.