Why is 4oz of dry mix and 4oz of water not the same measurement?

4 ounces of dry mix and 4 ounces of water are not the same measurement because they represent different substances with different densities. While both are measured by weight, the volume they occupy can vary significantly due to their physical properties. For example, 4 ounces of a dry mix may take up more space than 4 ounces of water because the dry mix may contain air pockets. Therefore, their volume and behavior in a mixture can differ even if they are measured in the same weight.