There isn't one, just a description. There are three descriptions; solid, liquid, & gas.
Temperature would be the typical answer.
The density and state of the subtance of the particular layer.
what you are trying to measure
substance
Mass is a measure of the total amount of matter in an object. It determines an object's resistance to changes in its state of motion. The SI unit for mass is the kilogram (kg).
Each individual state legislature determines the districts.
Diamond.
Milk is a substance. Everything is.
Osmium
You use a ruler or tape measure to measure this in units of choice
The mean corpuscular volume is the measure that determines the average size of an erythrocyte. The erythrocyte is what is commonly known as red blood cells.
a liquid