Numerically two thermometers, one in Fahrenheit scale and another in Celsius scale shall read same at

The Celsius and Fahrenheit scales intersect at a specific numerical value where both thermometers read the same temperature. This point is -40!. The relationship between the two scales is defined by the conversion formula:!F = (!C! 1.8) + 32 [1]. To find the point of equality, one can set!F equal to!C in the equation (x = 1.8x + 32). Solving for x yields -0.8x = 32, which results in x = -40. This unique temperature is often cited as a reference point for extreme cold. Other common reference points include the freezing point of water (0!C or 32!F) and the boiling point of water (100!C or 212!F), but at these values, the numerical readings differ significantly between the two systems [1].

Sources

1. [1] https://www.swc.nd.gov/arb/news/atmospheric_reservoir/pdfs/2015_05%20-%20Fahrenheit%20vs%20Celsius.pdf