👉 A backup fluid, often referred to as a fail-safe fluid or emergency fluid, is a secondary liquid system designed to ensure continued operation of critical components in the event of a primary fluid failure. Typically, this fluid is inert and non-reactive, meaning it doesn't interfere with the function of mechanical or electronic parts. In systems like hydraulic or pneumatic machinery, backup fluids provide a reliable source to maintain pressure and function when the primary fluid supply is interrupted due to leaks, contamination, or other issues. This redundancy enhances system reliability and safety by preventing sudden shutdowns or failures that could result from a loss of primary fluid supply.