For general everyday use, weight and mass are the same. In physics however, there are formulas for calculating different types of mass. They can be viewed at the following Web address:
http://en.wikipedia.org/wiki/Mass
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The mass of an object is a measure of how much matter it contains, while weight is a measure of the force of gravity acting on an object. Therefore, the mass of a 1-pound football would still be 1 pound (or approximately 0.45 kilograms).
A mass of 1 kilogram weighs 9.8 newtons (2.205 pounds) on earth.The same mass weighs 1.6 newtons (0.36 pound) on the moon.
There are approximately 0.45 kilograms in one pound.
First take the weight in pounds and multiply by 453.59. The resulting number is the weight in grams. To convert grams to kilograms, simply divide by 1000. Or, an easier option is to take the weight given in pounds and multiply by 0.45359. In this case the answer is 1 kilograms.
== http://lmgtfy.com/?q== pounds+to+kilogram ==
No answer can be given that's always true, because the pound and the kilogram are units of two different kinds of quantities. The pound is a unit of force, whereas the kilogram is a unit of mass. On Earth, 0.4536 kilogram weighs 1 pound, but on the moon, 2.741 kilograms weigh 1 pound. One pound is the weight of different amounts of mass in different places.