On the surface of the earth, the mass of 1kg is about 2.20 pounds (lb). Conversely, the mass of an object weighing 1 lb on the earth's surface is about 0.454kg. There are not only quantitative differences but also qualitative differences between kg and lb. Kilogram represents mass, while pound represents weight. It is the force that an object falls to an obstacle at an acceleration. The surface of Mars is only 37% of the acceleration of gravity on the surface of the Earth. On it, the mass of 1kg is 0.8 14lb. On the orbit, or on the medium passing through space, the net acceleration is zero, and the mass of 1kg has no weight. In other words, weightlessness.
Mass is usually described in units smaller than kilograms, and the prefix factor 10 is usually added in front of it. The mass of one gram (1g) is 10-3kg. The mass of one milligram (1mg) is 10-6kg, that is, 10-3g. A microgram (1 microgram) has a mass of 10-9 kg or 10-6 g ... and a nanogram (1ng) has a mass of10/2 kg, that is/kloc.
Please refer to the standard international system of units (SI) and prefix multiplier.
The basic unit of mass in the international system, equal to 1 000 kg (2.2046 lb). See the table when measuring.
Judging from this sentence, if you write kilograms, you should use S.
But if you are shorthand, you have to use kg, because it is both an abbreviation of kg and an abbreviation of kg, and there is no such thing as kgs.
kilogram
Abbreviations.
= kg