Final answer:
Unheated bubble humidifiers are commonly used with respiratory system infections, such as bronchitis, to help alleviate symptoms and make breathing easier.
Step-by-step explanation:
Unheated bubble humidifiers are commonly used with respiratory system infections, such as bronchitis. Inhaling moist air from a humidifier can help loosen and thin mucus in the respiratory system, making it easier to breathe. This can provide relief from symptoms such as coughing, sore throat, and chest congestion. Figure 16.6.1 shows a child enjoying the air from a humidifier, which can be beneficial for individuals with respiratory infections.