What characteristic distinguishes the thermal method of inkjet printing?

The thermal method of inkjet printing is characterized by its ability to heat the ink, causing it to expand and form a bubble. This bubble ejects a droplet of ink onto the paper as it collapses. This process involves heating elements that create rapid vaporization of the ink, which allows precise control over the size and placement of the ink droplets, resulting in high-quality images and text.

The other options do not accurately describe the thermal method of inkjet printing. For example, piezoelectric elements are specific to another type of inkjet printing known as piezoelectric inkjet printing, which uses mechanical pressure to push the ink out. The frequency of cartridge replacement varies among different printer models and is not inherently related to the thermal method. Lastly, although ink cartridges are commonly used for thermal inkjet printers, saying the method operates without them misrepresents the technology, as the presence of cartridges is typical in this printing method.