90. According to the FDA Food Code, what best describes the accuracy of the bimetallic thermometer?

A. It is consistently accurate.
B. It is accurate to ±2°F or ±1°C.
C. Calibration is not required.
D. It is often inconsistent and a second temperature check is recommended.



Answer :

Final answer:

Bimetallic thermometers use differential metal expansion to measure temperature accurately despite potentially lower precision than digital thermometers.


Explanation:

Bimetallic thermometers consist of two different metals, like brass and steel, that react to temperature changes by coiling or uncoiling due to varying thermal expansion coefficients. The accuracy of a bimetallic thermometer is determined by the differential expansion of the metals within it, allowing for temperature measurements by observing the resulting coil movement. Compared to digital thermometers, bimetallic thermometers may have a slightly lower precision due to the nature of their design.


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