Conversion of scales of temperature

Temperatures on scales that either do not share a numeric zero or are nonlinearly related cannot correctly be mathematically equated (related using the symbol =), and thus temperatures on different scales are more correctly described as corresponding (related using the symbol ≘).

[citation needed] * Normal human body temperature is 36.8 °C ±0.7 °C, or 98.2 °F ±1.3 °F.

The commonly given value 98.6 °F is simply the exact conversion of the nineteenth-century German standard of 37 °C.

Since it does not list an acceptable range, it could therefore be said to have excess (invalid) precision.

To convert a delta temperature from degrees Fahrenheit to degrees Celsius, the formula is {ΔT}°F = ⁠9/5⁠{ΔT}°C.