If the question is regarding helium's density, helium has a very low density as its natural state is as a gas. It's density is 0.0001785 grams per cubic centimeter.
Helium-filled objects "float" in most substances that aren't primarily hydrogen or helium because of it's less dense. Helium has a weight of 0.1785 grams per liter. Nitrogen, on the other hand, which makes up 80% of the air we breathe, weighs 1.2506 grams per liter. Things that are lighter over the same surface area are more buoyant.However, helium isn't the lightest element. Hydrogen, weighing a mere 0.08988 grams per liter, is. The reason hydrogen isn't used as commonly as helium to fill things is because of the high flammability of hydrogen, with a small spark causing a hypothetical hydrogen balloon to explode.
Yes, all substances have density. Helium has a density of 0.1664 g/liter at 20°C and one atmosphere of pressure.
It depends on the metal. Lithium has lower density than water: 0.534 kg per liter. Copper is 8.94 kg per liter. Tungsten, which is now used as sinkers for fishing is 19.25 kg per liter. Osmium is the density champion at 22.59 kg per liter.
55,360 grams per liter.
helium
Gases normally have a density of a few grams per liter (i.e., per cubic decimeter), at most. Air, for example, has a density of about 1.2 grams per liter, at standard temperature and pressure. The standard SI unit for density would be kilogram per cubic meter (which actually happens to be equivalent to grams per liter!), but many people are still accustomed to specify the density per liter, not per cubic meter.
density is measured in grams per liter (g/L)
Around 0.12 percent, it differs in different countries depending on the environment and altitude.
Divide the density in kilograms per liter by the volume in liters
The density changes due to differences in the density between cream and milk. Cream is lighter than water and milk is heavier than water. The average density of whole milk could be close to 1.024g per liter. When the cream is removed, the density of the milk goes up to about 1.036g per liter, while the density of the cream is about 0.968g per liter.
Kilogram is mass. Liter is volume. The only way you can relate the two is if you have a substance of known density. For example, water has a density of 1 kg per liter.