Unit conversion is the process of expressing the same property in a different unit of measurement. For instance, measuring a distance in kilometers instead of miles, or weighing something in kilograms instead of pounds.
Every unit within a specific category (like Length or Weight) is related to a standard base unit (like meters or grams) by a specific multiplication factor. To convert from Unit A to Unit B, we first convert Unit A to the base unit, and then from the base unit to Unit B.
Suppose you are following a recipe that calls for 2 pounds (lb) of flour, but your kitchen scale only measures in grams. Since 1 pound is equal to 453.592 grams, you can multiply 2 by 453.592. The result is approximately 907 grams of flour.