A "kilopound" is not a standard unit of measurement in the International System of Units (SI) or in most common systems of measurement. Instead, it appears to be a non-standard or non-conventional term that combines two different units of measurement: "kilo" and "pound."
Kilo (k): Kilo is a prefix in the metric system that denotes a factor of 1,000. For example, one kilogram (kg) is equal to 1,000 grams.
Pound (lb): Pound is a unit of mass or weight commonly used in the United States and the United Kingdom, and it is abbreviated as "lb" (singular) or "lbs" (plural).
If someone were to use the term "kilopound," they might be referring to a weight or mass measurement that is equal to 1,000 pounds. However, this is not a standard or widely recognized unit of measurement. In most contexts, large masses are measured in tons or metric tonnes (1 tonne = 1,000 kilograms), rather than using "kilopounds."
The kilogram (kg) is the base unit of mass in the International System of Units (SI). It is defined as the mass of the International Prototype of the Kilogram (IPK), a platinum-iridium cylinder kept at the International Bureau of Weights and Measures (BIPM) in France.
Until May 20, 2019, the kilogram was defined by the physical prototype, but as part of the redefinition of the SI units, the kilogram was redefined in terms of fundamental constants. Since that date, the kilogram is defined by fixing the numerical value of the Planck constant (h) to be exactly 6.62607015 x 10^-34 joule-seconds.
This redefinition ensures that the value of the kilogram is now based on a constant of nature rather than relying on a physical object that could potentially change over time. It allows for a more precise and stable definition of the kilogram and other SI units.