If you mix water with fire, the fire would typically be extinguished or significantly weakened, depending on the amount of water and the size of the fire. Water is commonly used as a fire suppressant due to its cooling and smothering effects.
When water is added to a fire, it absorbs heat from the fire, which lowers the temperature below the point necessary for the combustion process to continue. Additionally, water can turn into steam when it comes into contact with fire, and the steam can displace oxygen from the area around the fire, further inhibiting the combustion process.
It's important to note that attempting to extinguish certain types of fires, such as oil or grease fires, with water can be dangerous. Water should be used safely and according to the appropriate firefighting guidelines and equipment.