Franz needs to measure the mass of an iron cube about the size of a table tennis ball. Which units are most appropriate for him to use?

"Gram" unit is the most appropriate unit for him to use based on the size of the tennis table ball. A tennis table ball has a diameter of 40mm and a volume of approximately 33.5 cubic centimeters (Calculation: 33.5 = 3.14*4^3). An iron has a density of 7850 kg per cubic meter and it has 0.22695 kilograms or 262.95 gram of mass if it has 33.5 cubic centimeters volume. Therefore, "Gram" is the most appropriate unit to measure this iron cube in order to get a detailed measurement of this thing.