-640 degrees Celsius = -1120°F (exact). Rounded: -1120°F. In Kelvin: -366.85 K. In Rankine: -660.33°R.
−40°C = −40°F — the unique point where both scales meet. Found in extreme continental winters.
Below freezing: -640°C = -1120°F. Key landmarks: 0°C = 32°F (freezing), −10°C = 14°F (cold winter), −20°C = −4°F (severe cold), −40°C = −40°F (where scales meet).
All temperature units: -1120°F · -366.85 K (Kelvin) · -660.33°R (Rankine). Kelvin starts at absolute zero (−273.15°C). Rankine is used in some US engineering applications.
Formula: °F = (°C × 9/5) + 32. For -640°C: (-640 × 1.8) + 32 = -1152 + 32 = -1120°F. Reverse: °C = (°F − 32) × 5/9 = (-1120 − 32) × 0.5556 = -640°C.
-640°C = -1120°F (exact: -1120°F). Formula: (-640 × 9/5) + 32 = -1120°F.
Multiply by 1.8 then add 32: -640 × 1.8 = -1152, + 32 = -1120°F. Quick estimate: double the Celsius value and add 30 → -1250°F (approximate).
Add 273.15: -640 + 273.15 = -366.85 K. Kelvin is used in science — 0 K is absolute zero (the coldest possible temperature).
−40°C = −40°F — the unique point where both scales meet. Found in extreme continental winters. In Fahrenheit: -1120°F is below freezing.