The answer section is formatted for on-screen use, not printing, and will waste a lot of paper if printed directly. Most people are between 3.2 and 6.5 feet tall, and sure enough, 1.60 m turns out to be about 5.2 ft. By definition, a liter of water at a certain temperature has a mass of one kg. Since a kilogram of water has a mass of 1,000 grams, it must be that 1,000 cubic centimeters has a mass of 1,000 grams. Thus one cubic centimeter has a mass of one gram.
Density is defined as the ratio of mass to volume.
So a large volume would have a large mass and a small volume would have a small mass and the ratio remains the same, no matter what the volume. This is the definition of a variable. This sounds familiar. A liter of water has a volume of one kilogram, or 1,000 grams.