Which SI unit is most appropriate for measuring density?

Explanation:

SI unit is the most appropriate measure, because it is the globally chosen common measurement for a certain quantity. For example, it may seem appropriate to measure the length in cm, but the SI unit is actually metres.

The SI unit of density is kg per meter cubed (kg/m^3)

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter