what is lb in weight

In weight, "lb" is an abbreviation for pound, which is a unit of mass used in the imperial and US customary systems. The international avoirdupois pound, which is the common pound used today, is defined as exactly 0.45359237 kilograms. The abbreviation "lb" comes from the Latin word "libra," which was an ancient Roman unit of mass that is now equivalent to 328.9 grams. In the UK, pounds are still used within certain contexts, such as labeling of packaged foods, and the UK also often uses both pounds and stones when describing body weight, where a stone is comprised of 14 pounds. To convert pounds to kilograms, you can use the conversion factor of 1 pound = 0.45359237 kilograms.