The study of density is a great educational exercise. This is physical science, scientific experimentation, math literacy, statistical analysis, and teamwork. I feel that this is a classic density lab and am not finding a variation on TpT. I hope this makes a contribution.
Density is grams per cubic centimeter. This is the same as miles per hour, or dollars per pound or miles per gallon, or gallons per square feet. This is right at the heart of math literacy!