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The Celsius reading equivalent to 70°F is?

  1. 25°C

  2. 18°C

  3. 21°C

  4. 28°C

The correct answer is: 21°C

To convert Fahrenheit to Celsius, you can use the formula: C = (F - 32) × 5/9. In this case, substituting in 70°F gives: C = (70 - 32) × 5/9 C = 38 × 5/9 C = 190/9 C ≈ 21.11°C. This rounds to approximately 21°C, which corresponds to the Celsius reading equivalent for 70°F. Understanding the conversion process is essential, as it allows gas fitters to work with both Celsius and Fahrenheit depending on the context of their work, especially when dealing with appliances or equipment that provide temperature readings in different units. This knowledge also reinforces the importance of accurate measurement when dealing with gas and heating systems.