Final answer:
The differences between AUTO, SEMI, and Manual modes are based on the level of user control. AUTO is fully automatic, SEMI allows partial manual control, and Manual gives full control over the system or device, requiring more user knowledge and expertise.
Step-by-step explanation:
The differences between AUTO, SEMI, and Manual modes of a pressurization system primarily involve the extent of user control over the system. In AUTO mode, the pressurization system operates completely automatically, adjusting parameters to maintain optimal conditions without user intervention. In SEMI mode, or semi-manual mode, the user has more control and can set certain parameters manually while the system automates others. For example, in the context of camera operation, semi-manual might refer to modes like shutter priority or aperture priority, where the user sets one parameter and the camera adjusts the other to achieve the correct exposure.
Manual mode gives the user full control over the pressurization system or in the case of cameras, full control over both shutter speed and aperture. This mode requires more knowledge and experience to operate effectively, as the user must understand how changes to one parameter affect the others to maintain the desired conditions. This mode is typically used when more precise control is necessary, such as in specialized photography settings or complex sterilization processes in an autoclave.