Final answer:
Hot foods should be placed in a refrigerator for cooling only after they have completely cooled to room temperature to prevent bacterial growth.
Step-by-step explanation:
Hot foods should be placed in a refrigerator for cooling only after they have completely cooled to room temperature, which is typically around 20-25 degrees Celsius or 68-77 degrees Fahrenheit. When hot foods are covered before cooling, the trapped heat can create a warm environment that promotes bacterial growth, which can lead to foodborne illnesses. By allowing the food to cool uncovered, you are preventing the growth of bacteria and ensuring food safety.