History quiz

What makes tea kettle whistle answer starts with humo?

Humidity in the Air

The amount of moisture in the air can affect the whistle of a tea kettle. If there is too much humidity, the water inside the kettle will take longer to boil, which can cause the whistle to sound weak or not at all. On the other hand, if there is too little humidity, the water will boil too quickly and cause the whistle to sound shrill or too loud.