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Controlling the temperature of food is one of the most important aspects of cooking. Bacteria and other microorganisms can grow inside of your food, causing illness and other disease. Not only is it important to cook your food to the proper temperature, but it is also important that your food is stored at correct temperatures. For example, pathogenic microorganisms grow very slowly when the temperature is below 40 degrees Fahrenheit, multiply and grow rapidly between 40 and 140 degrees Fahrenheit and are destroyed at temperatures higher than 140 degrees Fahrenheit. This highlights the significance of appliances with thermometers that give accurate temperature readings. For the most proper readings, appliance thermometers should be liquid-filled or bimetallic-coil. Liquid-filled are the oldest type of appliance thermometer. As the temperature increases, the colored liquid inside rises to the temperature on the scale. Bimetallic-coil thermometers are made of two different kinds of metals. Each has a different rate of expansion. The bimetal portion coils with a pointer stem at the other end. When there is an increase in temperature, the pointer rotates by the coiled element to indicate the temperature. Each of these gauges is effective in measuring the temperature in your appliances.