How does a self-contained kettle generate steam?

A self-contained kettle generates steam by utilizing an electric element or gas burner to heat water. In this system, the kettle consists of two main components: the heating element or burner and the water contained within the kettle itself. When the heating element or burner heats the water, it causes the water to reach its boiling point, where it then transforms into steam.

This process is efficient for cooking and food preparation because it allows for the direct and controlled generation of steam, which can be used for cooking various foods evenly. By heating the water directly, the kettle can produce steam on demand, making it convenient for chefs and kitchen staff.

The other options do not accurately describe the way a self-contained kettle operates. The steam jacket filled with hot air would not effectively generate steam for cooking purposes. Burning natural gas directly within the kettle could lead to uneven heating and is not a standard practice for steam generation within this equipment. An external steam source would not be applicable, as a self-contained kettle is designed to generate its own steam without needing an external supply.