Concentration can be measured as:Grams/m3 or mol/m3Grams/cm3 or mol/cm3Grams/dm2 or mol/dm2Grams/dm3 or mol/dm3

Concentration can be measured as:

1. Grams/m3 or mol/m3: This is a measure of mass or moles per cubic meter. It is often used in chemistry and physics to describe the concentration of a substance in a three-dimensional space.

2. Grams/cm3 or mol/cm3: This is a measure of mass or moles per cubic centimeter. It is a much smaller unit of volume than the cubic meter, and is often used in laboratory settings.

3. Grams/dm2 or mol/dm2: This is not a standard unit for measuring concentration. Concentration is a measure of how much of a certain substance is present in a certain volume, not area.

4. Grams/dm3 or mol/dm3: This is a measure of mass or moles per cubic decimeter. It is equivalent to liters, which is a common unit for volume in chemistry.

So, the correct units for measuring concentration would be grams/m3 or mol/m3, grams/cm3 or mol/cm3, and grams/dm3 or mol/dm3.