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.
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A liter is a unit of volume, the same as a cubic decimeter.
A gram is a unit of mass. A cubic metre is a unit of volume. The two units are therefore incompatible.
scientist use many tools but the most common is the tools in the SI unit and conversions-LENGTH meter,kilometer,decimeter,centimeter,millimeter,micrometer,nanometerVOLUME-cubic centimeter,liter,cubicmeter,millimeter MASS-kilogram,gram,milligram TEMPERTURE-kelvin,celsius scientist use many tools but the most common is the tools in the SI unit and conversions-LENGTH meter,kilometer,decimeter,centimeter,millimeter,micrometer,nanometerVOLUME-cubic centimeter,liter,cubicmeter,millimeter MASS-kilogram,gram,milligram TEMPERTURE-kelvin,celsius
Smaller. Because it goes: Basic Unit: liter, gram, meter Deci: deciliter, decigram, decimeter Centi: centiliter, centigram, centimeter Milli: milliliter, milligram, millimeter
Every unit in the International Standards of Units ("SI units") has a universal standardized definition. By universal, it is used everywhere. For instance, a meter is defined as "Length of the path travelled by light in a vacuum in 1⁄299,792,458 of a second (17th CGPM)" Yes. The definitions are usually pretty weird, but they stay consistent, which is important. Now, the reason why the milliliter and the cubic centimeter are the same is much simpler. The liter was originally created as another word for a cubic decimeter. Because there are 1000 milliliters in a liter, and 1000 cubic decimeters in a cubic centimeter[see note], a milliliter and a cubic centimeter and therefore, the same. Note: millimeter, centimeter, decimeter. While the centimeter is 10 times smaller than the decimeter, we are also dealing with cubic terms, so a cubic centimeter is therefore, 103 or 1000 times smaller than a cubic decimeter.