You are replacing an automotive type cooling water thermostat on one of the diesel generator sets on your ship docking tug. The markings on the original thermostat indicate that it was set to begin opening at 180°F. Which of the following thermostats marked for Celsius would be a replacement that comes closest to the value at which opening begins as compared to the original thermostat?
• Temperature conversion between Fahrenheit and Celsius • The relationship between a difference in Fahrenheit degrees and a difference in Celsius degrees • How to use the exact conversion formula vs. simple estimation
• First, convert 180°F to °C using the standard formula; write it out and work step by step. • After you get the Celsius value, look at each choice and see which is numerically closest to your converted value. • Check whether you are converting the actual temperature (180°F) and not just the difference from another point like freezing or boiling.
• Use the correct formula: subtract 32 before multiplying by the fraction, not after. • Be sure you’re using the factor 5/9 when going from Fahrenheit to Celsius (and not 9/5). • After conversion, compare the result to the choices and verify which one is closest in value, not just which one 'looks right'.
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