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Celsius to Fahrenheit conversion

Aviation Mechanic General (AMG) practice question 15 of 20 on Physics for Aviation. ACS element AM.I.J.R3 · difficulty: applied. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONA technical manual specifies a fluid temperature of 25 °C. What is this temperature in degrees Fahrenheit?

  1. A77 °F
  2. B57 °F
  3. C298 °F
Show the answer and explanation

Correct answer: A. 77 °F

  • A — correct Degrees Fahrenheit = (1.8 × Degrees Celsius) + 32 = (1.8 × 25) + 32 = 45 + 32 = 77 °F.
  • B — incorrect This adds 32 without first multiplying by 1.8. The Celsius value must be scaled before the offset is added.
  • C — incorrect Adding 273 converts Celsius to Kelvin, not to Fahrenheit.

BACKGROUND

Three temperature scales are used extensively: Centigrade (Celsius), Fahrenheit, and the absolute or Kelvin scale. The Centigrade scale places the freezing and boiling points of water at 0 and 100 with 100 divisions between; the Fahrenheit scale uses 32 and 212 with 180 divisions. Because some technical manuals use Centigrade or Kelvin while the Fahrenheit scale is common in the United States, a mechanic must know how to convert. The conversion formulas are: °F = (1.8 × °C) + 32; °C = (°F - 32) × 5/9; K = °C + 273; and Rankine = °F + 460. The Rankine scale is commonly used to convert Fahrenheit readings to absolute for gas law calculations.

STUDY TIP

For Celsius to Fahrenheit, multiply by 1.8 first and then add 32; a quick sanity check is that 0 °C is 32 °F and 100 °C is 212 °F.

KEY POINTS

  • °F = (1.8 × °C) + 32
  • °C = (°F - 32) × 5/9
  • Kelvin = °C + 273; Rankine = °F + 460

SOURCES

  • FAA-H-8083-30B ch05 "Temperature"
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SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-30B Aviation Maintenance Technician Handbook – General, 14 CFR part 43 and part 65. Regulations and handbooks are revised; confirm details against the current edition.