What are ultrasonic units primarily used for?

Ultrasonic units are primarily used for cleaning through the application of sound waves. These devices utilize high-frequency sound waves that generate vibrations in a cleaning solution, which creates millions of tiny bubbles. This process, known as cavitation, effectively removes dirt, grime, and contaminants from various surfaces and objects, including instruments, jewelry, and electronic components. The efficiency of ultrasonic cleaning makes it an ideal choice in both industrial and medical settings, where thorough cleaning is essential to ensure the safety and functionality of tools and devices.

The other options, while they might relate to sound or temperature in some way, do not capture the primary purpose of ultrasonic units. For instance, heating food quickly does not utilize ultrasonic technology, and while ultrasonic units create high-frequency sound waves, this is not their main application. Measuring body temperature falls outside the capabilities of ultrasonic technology altogether. Thus, the emphasis on cleaning using sound waves most accurately describes the core function of ultrasonic units.