- What is the formula to convert Celsius to Fahrenheit?
- Multiply by 1.8, then add 32. The formula is F = (C × 9/5) + 32. So 25 °C gives (25 × 1.8) + 32 = 77 °F. The +32 offset reflects that water freezes at 32 °F, not 0 °F, and the 9/5 factor accounts for the different degree sizes between the two scales.
- How do you convert Fahrenheit to Celsius?
- Subtract 32, then multiply by 5/9. The formula is C = (F − 32) × 5/9. Body temperature: (98.6 − 32) × 5/9 = 37 °C. This is the exact reverse of the C-to-F formula—remove the 32-degree offset first, then scale back to Celsius degree units.
- What is absolute zero in Fahrenheit?
- Absolute zero is −459.67 °F, or −273.15 °C and 0 K. It is the coldest possible temperature, where all molecular motion stops. No physical process can cool a substance below it. Both the Kelvin and Rankine scales place their zero at this point, giving them no negative values.
- What temperature reads the same in Celsius and Fahrenheit?
- −40°. Check: (−40 × 9/5) + 32 = −72 + 32 = −40. That is the only point where both scales agree. Below −40, the Fahrenheit reading is always greater; above it, the Celsius reading is always higher.
- Is Kelvin better than Celsius for everyday use?
- Not for daily life. Celsius is intuitive—0° freezes water, 100° boils it—which is why it is used for weather, cooking, and medicine in most countries. Kelvin is for science and engineering, where negative temperatures break thermodynamic equations. The scales share the same degree size, so converting is always +273.15.