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METEOROLOGIST JEFF HABY. F = 9/5*C + 32. To find the temperature both scales are equal we can use another equation and combine it with this previous equation. The equation is simply F = C. Plug in for F or C and solve. C = 9/5*C + 32. -4/5*C = 32. F = 9/5*F + 32. -4/5*F = 32. Thus, at the cold temperature of negative 40, this temperature is the same on both the Fahrenheit and Celsius temperature scales.
Â°C = K â 273.15. On the Celsius scale, the freezing and boiling points of water are exactly 100 degrees apart, thus the unit of the Fahrenheit scale, a degree Fahrenheit, is 5/9 of a degree Celsius. The Fahrenheit scale coincides with the Celsius scale at -40 Â°F, which is the same temperature as -40 Â°C. The Fahrenheit scale was the primary temperature standard for climatic, industrial and medical purposes in most English-speaking countries until the 1960s.