I consider myself pretty conversant in metric units. I know that 20 kilograms is 44 pounds (double it and add 10%) and that five kilometers is a little over three miles (I’ve, uh, run a lot of 5Ks).

Two temperature scales, centigrade and Fahrenheit, are in common use in meteorology. Most nations use the centigrade scale, but Fahrenheit remains in use in the United States. The boiling point of ...

Students often struggle with temperature conversions in science courses due to time constraints. A simplified approximation method offers a solution by using basic arithmetic: double Celsius and add ...