Final answer:
Refrigerator thermometers are used to measure air temperature in food storage, ensuring foods are kept at safe temperatures. They are different from ambient air thermometers, infrared thermometers, and bimetallic stem thermometers which serve various other purposes.
Step-by-step explanation:
The correct answer to the question is b) Refrigerator thermometers. Refrigerator thermometers are specifically designed to accurately measure the air temperature within a food storage area, such as a refrigerator or freezer, ensuring that food is stored at safe temperatures to prevent spoilage and growth of bacteria.
Ambient air thermometers measure the temperature of the air in a specific environment but might not be as precise for refrigeration, while infrared thermometers allow for a non-contact surface temperature reading, which is not directly related to air temperature.
On the other hand, bimetallic stem thermometers are typically used to measure the internal temperatures of solid foods and are not the ideal choice for measuring air temperature in food storage.
Temperature scales such as Fahrenheit, Celsius, and Kelvin are used to express measurements obtained from thermometers. Alcohol thermometers and liquid crystal thermometers are other types used for various purposes.
For example, liquid crystal thermometers are sensitive to heat changes and are used to measure skin or body temperature. The pyrometer, which is another type of infrared thermometer, is used in industrial settings to gauge the heat of objects from a distance.