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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.
By Anne Marie Helmenstine, Ph.D. The three common temperature scales are Celsius, Fahrenheit, and Kelvin. Each scale has its uses, so it's likely you'll encounter them and need to convert between them. Fortunately, the conversion formulas are simple:seful Temperature Facts. 1  Celsius and Fahrenheit are the same at -40Â°. 2  Water boils at 100Â°C or 212Â°F. 3  Water freezes at 0Â°C and 32Â°F. 4  Absolute zero is 0 K. 5  Celsius and Fahrenheit are degree scales.