In situ heating is a research area that involves the application of heat directly to a material or system under study while it remains in its original location or environment. This technique allows researchers to observe and study the effects of heating on the material's properties, such as phase transitions, chemical reactions, and structural changes, in real-time. In situ heating is commonly used in materials science, chemistry, and geology to investigate the behavior of materials under extreme heat conditions, and has applications in fields such as materials design, environmental science, and energy research.