MCQ Detailed View

The correct answer is 32 °F. On the Fahrenheit scale, the freezing point of pure water is defined as 32 degrees, while the boiling point is defined as 212 degrees at standard atmospheric pressure. This scale was developed by the German physicist Daniel Gabriel Fahrenheit in the early 18th century.

To understand this, it helps to compare different temperature scales:

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  On the Celsius scale, water freezes at 0 °C and boils at 100 °C.

  
  


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  On the Fahrenheit scale, water freezes at 32 °F and boils at 212 °F.

  
  


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  On the Kelvin scale, water freezes at 273 K and boils at 373 K.

  
  

The difference between the freezing and boiling points of water on the Fahrenheit scale is 180 degrees. This results in smaller units compared to Celsius, where the difference is 100 degrees.

The conversion formulas between Fahrenheit and Celsius are:

°F=(95×°C)+32°F = \left(\frac{9}{5} \times °C\right) + 32°F=(59×°C)+32 °C=(59×(°F−32))°C = \left(\frac{5}{9} \times (°F - 32)\right)°C=(95×(°F−32))

For example, if water freezes at 0 °C, applying the formula gives:

°F=(0×95)+32=32°F°F = (0 \times \tfrac{9}{5}) + 32 = 32 °F°F=(0×59)+32=32°F

This proves that 32 °F corresponds exactly to 0 °C.

The Fahrenheit scale is still widely used in the United States for weather forecasts, household appliances, and everyday temperature measurements, while most of the world uses the Celsius scale for scientific and daily purposes.

🔑 Key Facts:

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  Water freezes at 32 °F = 0 °C = 273 K.

  
  


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  Water boils at 212 °F = 100 °C = 373 K.

  
  


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  Fahrenheit scale interval: 180 degrees between freezing and boiling.

  
  


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  Developed by Gabriel Fahrenheit in 1724.

  
  


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  Commonly used in the United States, Celsius is global standard.

  
  

👉 Final Answer: The freezing point of water on the Fahrenheit scale is 32 °F.