Celsius, Fahrenheit, Kelvin, Réaumur, and Rankine Temperature Conversion

Celsius, Fahrenheit, Kelvin, Réaumur, and Rankine are different temperature scales used to measure temperature. To convert between them, you can use various mathematical formulas. For example, to convert from Celsius to Fahrenheit, you can use the formula: Fahrenheit = (Celsius × 9/5) + 32. Similar conversion equations exist for other scales.

Temperature Conversion

Here’s a temperature conversion table between Celsius, Fahrenheit, Kelvin, Réaumur, and Rankine:

Celsius (°C)Fahrenheit (°F)Kelvin (K)Réaumur (°Re)Rankine (°R)

This table shows conversions between these five temperature scales for selected values. You can use the appropriate formulas for more precise conversions.


  1. How do you convert Celsius Fahrenheit to Kelvin Rankine?
    • To convert from Celsius to Kelvin, add 273.15. To convert from Fahrenheit to Rankine, add 459.67.
  2. What are the differences of Celsius Fahrenheit Kelvin and Rankine temperature?
    • Celsius and Kelvin are based on the same scale but differ in their zero points. Fahrenheit and Rankine have different scales with different zero points, and Fahrenheit uses smaller degree increments.
  3. What is the conversion formula between Rankine and Fahrenheit?
    • The formula to convert Fahrenheit (°F) to Rankine (°R) is: Rankine = Fahrenheit + 459.67.
  4. What are the 4 temperature scales?
    • The four common temperature scales are Celsius, Fahrenheit, Kelvin, and Rankine.
  5. What are the five 5 different temperature scales?
    • The five different temperature scales include Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur.
  6. Is Kelvin same as Rankine?
    • No, Kelvin and Rankine are not the same. They have different zero points and scales.
  7. Does NASA use Rankine?
    • NASA primarily uses the Kelvin scale in scientific and engineering applications, but they may use Rankine when needed for specific purposes.
  8. Why do we use Celsius and Fahrenheit instead of Kelvin?
    • Celsius and Fahrenheit are often used for everyday temperature measurements because they are more relatable to human experiences, while Kelvin is commonly used in scientific and engineering contexts.
  9. Does anyone use Rankine?
    • Rankine is less commonly used than Celsius, Fahrenheit, and Kelvin. It is mainly used in some engineering and thermodynamics applications.
  10. What is the conversion of temperature to Rankine?
    • There is no single “conversion to Rankine” since Rankine is a temperature scale in its own right. To convert between other scales and Rankine, you would use the respective conversion formulas.
  11. What is the correct formula for converting between Fahrenheit to Celsius?
    • The formula to convert Fahrenheit (°F) to Celsius (°C) is: Celsius = (Fahrenheit – 32) / 1.8.
  12. What is the correct formula and conversion of Celsius to Fahrenheit?
    • The formula to convert Celsius (°C) to Fahrenheit (°F) is: Fahrenheit = (Celsius * 1.8) + 32.
  13. What is the difference between Fahrenheit and Kelvin?
    • The key difference is in their zero points and degree increments. Fahrenheit has a different zero point and smaller degree increments than Kelvin.
  14. What is Fahrenheit 0 based on?
    • Fahrenheit 0 is based on a mixture of ice, water, and ammonium chloride. It was historically used as a reference point but is no longer in common use.
  15. What is the difference between Kelvin and Celsius?
    • The main difference is their zero points. Kelvin starts at absolute zero (0 K), while Celsius starts at the freezing point of water (0°C).
  16. Why is 32 freezing in Fahrenheit?
    • The choice of 32°F as the freezing point of water in the Fahrenheit scale is historical and not based on any particular scientific rationale.
  17. Which came first Celsius or Fahrenheit?
    • The Celsius scale, also known as the centigrade scale, was developed by Anders Celsius in 1742. The Fahrenheit scale, created by Daniel Gabriel Fahrenheit, predates it, as it was introduced in the early 18th century.
  18. Why is Fahrenheit better?
    • The preference for Fahrenheit or Celsius depends on regional conventions and personal familiarity. Neither is inherently better; they serve different purposes and contexts.
  19. Is there anything hotter than Kelvin?
    • No, Kelvin is an absolute temperature scale, and there is no concept of “hotter than Kelvin.”
  20. Can Celsius and Kelvin ever be the same?
    • No, Celsius and Kelvin are different scales, and they do not align in such a way that they can be the same.
  21. Is Kelvin colder than Celsius?
    • No, Kelvin and Celsius use different zero points, but they have the same size degree increments, so the temperature values are proportional. A change of 1 degree in Celsius is equivalent to a change of 1 Kelvin.
  22. How many Fahrenheit is absolute zero?
    • Absolute zero in Fahrenheit is approximately -459.67°F.
  23. What is the absolute zero in Kelvin?
    • Absolute zero in Kelvin is 0 K.
  24. How close have we gotten to absolute zero in Celsius?
    • Scientists have achieved temperatures extremely close to absolute zero in the laboratory, within billionths of a degree Celsius above absolute zero.
  25. Why is Kelvin not a degree?
    • Kelvin is an absolute temperature scale and is not measured in degrees. It starts at absolute zero, making it an absolute temperature measurement.
  26. Why Kelvin is not used in thermometers?
    • Kelvin is less commonly used in everyday thermometers because its zero point is extremely low, making it impractical for many temperature measurements.
  27. Why is Kelvin more appropriate than Celsius?
    • Kelvin is more appropriate for scientific and engineering applications involving temperature because it is an absolute scale that starts at absolute zero, making calculations more straightforward.
  28. What did Rankine invent?
    • William Rankine was a Scottish engineer and physicist known for his work in thermodynamics and the development of the Rankine scale.
  29. At what temperature does water boil in Rankine?
    • Water boils at approximately 671.67°R on the Rankine scale.
  30. Why do we use Rankine instead of Fahrenheit?
    • Rankine is used in some engineering applications, especially in the United States, where the Fahrenheit scale is common. It provides a consistent absolute temperature scale.
  31. What countries use Fahrenheit?
    • The United States primarily uses the Fahrenheit scale for daily temperature measurements. Some other countries also use it for specific purposes.
  32. At what temperature are Rankine and Fahrenheit the same?
    • Rankine and Fahrenheit are equivalent at -459.67°R, which is also the absolute zero point for both scales.
  33. What is the formula for converting Celsius to Kelvin?
    • The formula to convert Celsius (°C) to Kelvin (K) is: Kelvin = Celsius + 273.15.
  34. What is the formula for Kelvin?
    • The Kelvin scale is an absolute scale, so it does not have a formula for conversion from other temperature scales.
  35. Why is degrees Fahrenheit the same as Celsius?
    • The numerical values of degrees Fahrenheit and degrees Celsius are the same at -40. This is a coincidental alignment of the two scales.
  36. Is Fahrenheit hot or cold?
    • Fahrenheit is a scale used for measuring temperature. Whether a temperature is considered hot or cold depends on individual perception and context.
  37. Is Kelvin hotter or colder than Celsius?
    • Kelvin and Celsius are equivalent at the same numerical value; they represent temperature in the same way. The choice between them does not make one “hotter” or “colder” than the other.
  38. Which is more accurate Kelvin or Fahrenheit?
    • Kelvin and Fahrenheit are both accurate temperature scales when used appropriately for their intended purposes. The choice of scale depends on the context of the measurement.
  39. Is absolute zero equal to 0 Kelvin?
    • Yes, absolute zero is defined as 0 Kelvin, which is the lowest temperature possible in the Kelvin scale.
  40. Is Fahrenheit based on horse blood?
    • No, the Fahrenheit scale is not based on horse blood. It was originally based on the freezing and boiling points of water and the temperature of a human body.
  41. What is 100 degrees in Fahrenheit in Celsius?
    • 100 degrees Fahrenheit is approximately 37.78 degrees Celsius.
  42. What is the logic behind Fahrenheit?
    • The Fahrenheit scale was initially based on the freezing and boiling points of water and the human body’s temperature, with 0°F set to the coldest temperature achievable at the time.
  43. Can Kelvin be negative?
    • No, Kelvin cannot be negative. It starts from absolute zero, which is the lowest possible temperature.
  44. How does 1 Kelvin compare to 1 degree Celsius?
    • One Kelvin is equivalent to one degree Celsius in terms of temperature difference. The size of the degree is the same for both scales.
  45. Is 1 Celsius greater than Kelvin?
    • No, 1 Celsius and 1 Kelvin are the same temperature value; they represent temperature in the same way.
  46. Why is 0 not freezing in Fahrenheit?
    • The choice of 0°F as the freezing point of water in the Fahrenheit scale was historical and not based on a scientific reference.
  47. What’s the boiling point in Fahrenheit?
    • The boiling point of water in Fahrenheit is approximately 212°F.
  48. What is boiling in Fahrenheit?
    • Boiling in Fahrenheit occurs at approximately 212°F when measured at standard atmospheric pressure.
  49. When did the UK stop using Fahrenheit?
    • The UK largely adopted the Celsius scale in the 1960s, although Fahrenheit is still sometimes used for specific applications.
  50. Why does the US use Fahrenheit?
    • The United States continues to use the Fahrenheit scale due to historical convention and existing infrastructure. It is used for everyday temperature measurements.
  51. Why do Celsius and Fahrenheit meet at -40?
    • The -40 temperature point where Celsius and Fahrenheit scales align is coincidental and based on historical developments in both scales.
  52. Do Germans use Fahrenheit?
    • No, Germany predominantly uses the Celsius scale for temperature measurements.
  53. Why do we use Kelvin?
    • Kelvin is used in scientific and engineering applications because it is an absolute temperature scale that simplifies calculations involving temperature.
  54. Who invented Fahrenheit?
    • Daniel Gabriel Fahrenheit, a Polish-German physicist, invented the Fahrenheit temperature scale in the early 18th century.
  55. Why is 0 Kelvin not possible?
    • Absolute zero at 0 Kelvin represents the lowest possible temperature, where molecular motion ceases. It is theoretically attainable but challenging to achieve in practice.
  56. What’s the coldest thing in the universe?
    • The coldest natural temperature in the universe is near absolute zero, but scientists have achieved even colder temperatures in laboratory settings.
  57. What is the max temperature a human can survive?
    • The maximum temperature a human can survive depends on various factors, but sustained exposure to temperatures above 130°F (54°C) can be life-threatening.
  58. Which came first Kelvin or Celsius?
    • The Celsius scale, developed by Anders Celsius, came first in 1742. The Kelvin scale was introduced later.
  59. Is 1 degree Celsius equal to 1 degree Fahrenheit?
    • No, 1 degree Celsius is not equal to 1 degree Fahrenheit. The size of the degree is different in the two scales.
  60. Why can’t temperature be added?
    • Temperature can be added or subtracted in the same scale, but it cannot be directly added across different temperature scales because they have different zero points.
  61. Why do we use Kelvin instead of Celsius in Charles Law?
    • Kelvin is used in Charles’s Law (and other gas laws) because it is an absolute temperature scale, which is essential for accurate gas law calculations.
  62. Is 0 Celsius warmer than 0 Kelvin?
    • No, 0 Celsius and 0 Kelvin are the same temperature value, representing absolute zero, where there is no molecular motion. Neither is “warmer” than the other.
  63. Is there anything colder than absolute zero?
    • No, absolute zero is the lowest possible temperature, and it is theoretically the point at which molecular motion ceases.
  64. Has absolute zero ever been reached?
    • Scientists have approached but not reached absolute zero in laboratory settings, achieving temperatures very close to it.
  65. What is absolute zero in Rankine?
    • Absolute zero in Rankine is 0°R, the same as in the Kelvin scale.
  66. What is the hottest temperature possible?
    • The hottest temperature possible in the universe is often considered to be the Planck temperature, around 1.416808(33) x 10^32 Kelvin.

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