Pressure relief refers to the process of reducing excess pressure in a system to prevent damage or failure. This is commonly applied in various fields, such as engineering and medicine. For example, in a boiler, pressure relief valves are used to release steam when pressure exceeds safe levels, ensuring the system operates safely. In medical contexts, pressure relief is crucial for patients who are bedridden. Special mattresses and cushions are designed to redistribute body weight, reducing pressure on specific areas and preventing pressure ulcers. Regular repositioning of patients is also a key practice to maintain skin integrity and overall health.