محول مئوية إلى فهرنهايت

The US adopted Fahrenheit early in its history, and by the time the metric system gained global acceptance, the cost of converting every thermometer, weather station, oven, and documentation was deemed too high. Additionally, Fahrenheit provides more whole number precision for everyday temperatures - the range of livable temperatures (0-100°F) has 100 increments versus about 55 in Celsius (-18 to 38°C).

For rough estimates: double the Celsius, subtract 10%, and add 32. For example: 20°C × 2 = 40, minus 10% (4) = 36, plus 32 = 68°F. The actual answer is 68°F, so this method works well for everyday use. For more precision, remember key points: 0°C=32°F, 10°C=50°F, 20°C=68°F, 30°C=86°F.

Fahrenheit originally set human body temperature at 96°F on his scale. Later, more accurate measurements showed normal body temperature as 98.6°F (37°C). This precise decimal comes from converting the round Celsius number. Interestingly, recent studies suggest average human body temperature has dropped to about 97.9°F (36.6°C) since the 1800s.

Fahrenheit provides more precision without decimals. Each Celsius degree equals 1.8 Fahrenheit degrees, so Fahrenheit has almost twice the resolution. For example, 20-21°C spans 68-69.8°F, giving Fahrenheit 3 whole number options (68, 69, 70°F) versus Celsius's 2 (20, 21°C). This is why some argue Fahrenheit is better for weather and human comfort ranges.

No, oven temperatures vary by country and type. US ovens use Fahrenheit, while most others use Celsius. Additionally, gas ovens often use 'gas marks' in the UK (Gas Mark 4 = 350°F = 180°C). Fan/convection ovens typically run 20-25°C (35-45°F) hotter than conventional ovens, so recipes often specify which type they're written for.