Why not use the formula to convert from Celsius to Fahrenheit (or the other way round), to convert both temperatures to the same scale. Then you can easily compare them.
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-40 f=-40 c
If C is Celsius temperature and F is the Fahrenheit temperature, the relation between them is: F=(9/5)C+32 You can graph that into a linear function. And since the line y=x (this is when y is Celsius) and y=(9/5)x+32 (this is when y is Fahrenheit) have different slopes, they are going to meet once on the graph. (Different slopes mean they are not parallel and only parallel lines don't meet each other in a 2D. And the point they meet is the point where C and F are equal. And if the temperature is hotter than that, F>C, and if the temperature is colder than that, C>F) x=(9/5)x+32 So x=-40 (C=-40, F=-40) Therefore if it's hotter than -40°C (or -40°F), Fahrenheit is bigger than Celsius (when it's the same amount of heat). And if it's colder than -40°C (or -40°F), Celsius is bigger than Fahrenheit (when it's the same amount of heat)
0 C = 32 F 100 C = 212 F 180 degrees F equals the measurement of 100 degrees C 9 degrees F therefore equals 5 degrees C -40 F is 72 degrees F below freezing -40 C is 40 degrees C below freezing Convert F to C 5 times -72 is -360 divided by 9 is -40 C convert C to F 9 times -40 is -360 divided by 5 is -40 F
-40 c = -40 f
(-40) degrees Fahrenheit = -40 degrees Celsius.