Final answer:
To ensure food safety, check the temperature of a refrigerated green smoothie using a thermometer in the refrigerator, keeping it at or below 40 degrees F to inhibit bacterial growth.
Step-by-step explanation:
To check the temperature of a refrigerated green smoothie, you should use a thermometer in the refrigerator where the smoothie is being kept cold. It's essential to ensure that the refrigerator's temperature is maintained at or below 4 degrees C (40 degrees F) to inhibit bacterial growth in refrigerated foods. For a smoothie in the refrigerator, you do not check the temperature in the freezer, in the blender, nor in the microwave since these locations do not reflect the storage temperature of the smoothie. Furthermore, when there's a power outage, it’s important to monitor that the refrigerator temperature stays below 40 degrees F to keep the food safe. Foods that have been left at temperatures above 40 degrees F for more than two hours may not be safe to eat, even if they are subsequently heated well.