暑さ

1. Origins, structure, and basic meaning

• Structure: 暑さ (あつさ) adds the nominalizing suffix さ to the adjective 暑い, producing “heat” or “degree of hotness.”
• Basic usage: It names summer heat and supports comparisons of how hot one year is relative to another.

2. Common pitfalls and similar expressions

• A noun for a condition or degree
  • Because 暑さ is nominal, it can be avoided as an object or measured and compared as a degree.