same size and shape
With thermometers
Celsius and Fahrenheit thermometers will read the same temperature at -40 degrees, as -40 degrees Celsius is equal to -40 degrees Fahrenheit.
Thermometers may be calibrated in degrees Fahrenheit or degrees Celsius.
Thermometers can be calibrated to measure temperature in Celsius, Fahrenheit, or Kelvin. Most common thermometers used for everyday purposes usually measure temperature in Celsius.
clinical thermometers measure temperature in Celsius.
At -40 degrees.
0 degrees
They measure temperature. In America, Fahrenheit, and in other parts of the world they measure in Celsius.
At a temperature of -40 (minus forty) degrees, the Celsius and Fahrenheit scales read the same number.
The instruments used in all temperature measurement are Thermometers. Fahrenheit and Celsius are just two different scales of temperature measure.The conversions are:Celsius to Fahrenheit:[°C] = ([°F] − 32) × 5⁄9Fahrenheit to Celsius:[°F] = [°C] × 9⁄5 + 32
negative 40 degrees
-40c (apex)