Chemical Engineering - Chemical Engineering Basics - Discussion

23. 

Fahrenheit and Centigrade scales have the same readings at

[A]. -55°
[B]. -40°
[C]. -33°
[D]. -58°

Answer: Option B

Explanation:

No answer description available for this question.

Vivek said: (Mar 10, 2015)  
The formulas for converting between degree Celsius and degree Fahrenheit are:

°F = (°C * 9/5) + 32.

°C = (°F - 32) * 5/9.

To find the temperature when both are equal, we use an old algebra trick and just set °F = °C and solve one of the equations.

°C = (°C * 9/5) + 32.

°C - (°C * 9/5) = 32.

-4/5 * °C = 32.

°C = -32 * 5/4.

°C = -40.

°F = (°F * 9/5) + 32.

°F - (°F * 9/5) = 32.

-4/5 * °F = 32.

°F = -32 * 5/4.

°F = -40.

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