محول فهرنهايت إلى مئوية

For a rough estimate: subtract 30 and divide by 2. Example: 80°F - 30 = 50, divided by 2 = 25°C (actual: 26.67°C). For better accuracy, subtract 32, divide by 2, and add 10%. This works because 5/9 is roughly 0.5 + 10%.

Multiple factors: massive cost of changing road signs, weather stations, and industrial equipment; public resistance to change; and the fact that Fahrenheit works well for weather (0-100°F covers most habitable temperatures). Previous metrication attempts in the 1970s failed due to lack of mandate and funding.

Fahrenheit has smaller degree increments (180 degrees between freezing and boiling vs 100 for Celsius), making it technically more precise for whole numbers. However, with decimals, both are equally precise. Scientists prefer Celsius because it aligns with Kelvin and the metric system.

-40 degrees is identical in both scales. This is the only temperature where they intersect. It's extremely cold - colder than most freezers and approaching the temperature where many materials become brittle.

Most ovens in metric countries only show Celsius. However, many modern digital ovens can switch between units. American-made appliances exported globally often include both scales. Professional kitchens sometimes have both for international recipes.