膨張

1. Origins, structure, and basic meaning

• Structure: 膨張(ぼうちょう) means expanding in volume or scale and appears as 膨張する.
• Basic usage: It describes changes in air volume and growth in the scale of a city.

2. Common pitfalls and similar expressions

• Volume and quantity
  • 増加 focuses on an increase in number or amount, while 膨張 brings out growth in volume or scale.
• Change in the opposite direction
  • 収縮 describes shrinking or a reduction in volume and contrasts with 膨張 in physical changes.