Water turns into ice in the freezer when it is cooled to a temperature below its freezing point. The freezing point of pure water at standard atmospheric pressure (1 atm) is 0 degrees Celsius (32 degrees Fahrenheit). When the temperature of water reaches or drops below 0 degrees Celsius, its molecules slow down and come together to form a crystalline structure, transforming it from a liquid state to a solid state, which we commonly know as ice.
It's important to note that the freezing point of water can vary slightly depending on factors like pressure and the presence of impurities or dissolved substances. For instance, if water contains impurities or dissolved salts, its freezing point may be slightly lower than 0 degrees Celsius.
In a typical household freezer, water will begin to freeze when its temperature drops below 0 degrees Celsius. The time it takes for water to turn into ice in the freezer will depend on the freezer's temperature setting, the initial temperature of the water, and the container's size and material. Generally, it can take a few hours for water in a shallow container to freeze, while larger volumes or containers with thick walls might take longer.