Final answer:
To convert -111.1 °F to °C, you apply the conversion formula C = 5/9 × (F - 32), which results in -79.5 °C.
Step-by-step explanation:
The thermometer reads -111.1 °F, and we wish to convert this temperature to degrees Celsius (°C). The formula to convert Fahrenheit to Celsius is: C = 5/9 × (F - 32). By applying this formula:
C = 5/9 × (-111.1 °F - 32)
= 5/9 × (-111.1 - 32)
= 5/9 × (-143.1)
= -79.5 °C
Therefore, the temperature in degrees Celsius is -79.5 °C.