When the metric system was originally devised, the kilogram was defined so that 1,000 cubic centimeters (1 cubic decimeter) of pure water has a mass of exactly 1 kilogram.
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A kilogram is a unit of mass defined by the International System of Units (SI) as the mass of a specific platinum-iridium alloy cylinder called the International Prototype of the Kilogram (IPK). Any object with the same mass as the IPK, which is precisely equal to one kilogram, would have the same mass as a kilogram. This definition ensures consistency and accuracy in measurements of mass worldwide.
Half a kilogram is the mass in this case.Half a kilogram is the mass in this case.Half a kilogram is the mass in this case.Half a kilogram is the mass in this case.
1,000 grams is one kilogram in the International System of Units (SI). The kilo prefix means one thousand, so a thousand grams is a kilogram. Originally defined as the mass of a cubic decimeter (liter) of water, the kilogram is today standadized as the mass of a platinum-iridium international prototype kept at the International Bureau of Weights and Measures (Bureau International des Poids et Mesure, near Paris, France). A one-kilogram mass has an Earth weight of about 2.2 pounds.
"Weight" is not measured in kilograms.If your mass was originally 150 kg and you lost 1 kg of mass, then you lost 2/3rds of 1 percent of your original mass.
That is how they are defined. "Kilo" means 1000 and a gram is defined as a thousandth of a kilogram.