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At what temperature, Celsius and Fahrenheit readings will be same?

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WBCS Prelims 2015 Official Paper

Answer (Detailed Solution Below)

Option 4 : -40°

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The correct answer is -40°.

Key Points

  • The Celsius scale and the Fahrenheit scale coincide at -40°, which is the same for both.
  • The formula conversion between Fahrenheit and Celsius is: C/5 = (F-32)/9

Important Points

  • Water boils at 100 degrees Celsius or 212 degrees Fahrenheit, or 373.15 Kelvins.
  • Water freezes at 0 degrees Celsius or 32 Degrees Fahrenheit, or 273.15 Kelvins.
  • Absolute zero is 0 Kelvins. This is the lowest temperature of any substance.
  • 0°C is equal to 273.15 Kelvins. The basic formula is °C + 273.15 = K.
  • To convert Fahrenheit degrees into Kelvins, (°F − 32) × 5/9 + 273.15 = K.

Additional Information

  • Celsius scale was introduced by Andres Celsius.
    • In Celsius, scale water is taken as the base and certain standard values are set with respect to water, for example, the boiling point of water is 100 degrees Celsius, and the melting point is 0 degrees Celsius.
  • The Fahrenheit scale was introduced by Daniel Gabriel Fahrenheit.
    • According to this scale, the boiling point of water is taken as 212 degrees Fahrenheit and the melting point as 32 degrees Fahrenheit.
    • This gives the exact difference of 180.
  • The Celsius scale has a melting point of water as 100 degrees and the Fahrenheit scale has 32 degrees.

Last updated on Jul 10, 2023

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