Originally a kilogram was defined as the mass of 1 litre of water:pure water at a pressure of one bar and a temperature of 4 deg Celsius (when it has its maximum density). However, it was subsequently redefined so that now it is the mass of a standard (or prototype) kilogram which has a mass of 1.000025 litres.
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1.125 kilograms is equal to 1125 grams. 3.9 kilograms is equal to 3900 grams.
15.35 tons is equal to 15,350 kilograms.
98 kilograms is equal to 98,000 grams or approximately 216.05 pounds.
135 tons is equal to 122,470.5 kilograms.
101 lbs is approximately equal to 45.81 kilograms.