加湿

1. Origins, structure, and basic meaning

• Structure: 加湿(かしつ) means humidification, adding moisture to the air to increase humidity.
• Basic usage: It describes controlling humidity in a dry room or a heated indoor space.

2. Common pitfalls and similar expressions

• Adding and removing moisture
  • 加湿 adds moisture; 除湿 removes it.
  • A device used for humidification is called 加湿器(かしつき).