1. One thousand one hundred fifty-seven kilograms is equivalent to eleven million five hundred seventy thousand grams.2. The gram (g) is a unit of mass, while the kilogram (kg) is one thousandth of a gram, which is approximately 0.501×10^23 times the mass of a C-12 atom.3. In the International System of Units (SI), mass units include meter, kilogram, and second, with kilogram being one of the seven fundamental units.4. The kilogram was established by the French Academy of Sciences during the French Revolution.5. The following are related mass conversion relationships: - 1 ton = 1,000,000 grams (one hundred million grams) - 1 kilogram (1 kg) = 1,000 grams (one thousand grams) - 1 jin = 500 grams (1 gram = 0.002 jin) - 1 milligram = 0.001 gram (1 gram = 1,000 milligrams) - 1 microgram = 0.000001 gram (1 gram = 1,000,000 micrograms) - 1 nanogram = 0.000000001 gram (1 gram = 1,000,000,000 nanograms)