Final answer:
To determine the density of a gallon of milk, weigh the gallon to find its mass and then divide by the gallon's volume in cubic centimeters (cc or cm³).
Step-by-step explanation:
To find the density of a gallon of milk, you should take the mass of the gallon of milk and then divide it by the volume of the gallon in cubic centimeters (cc or cm³). This is because density is defined as the mass of an object divided by its volume, which is mathematically represented as Density (D) = Mass (m) / Volume (V). Hence, the correct answer to the student's question would be option D: Find the mass of the gallon of milk and then divide by the number of cubic centimeters in a gallon.
First, you would weigh the gallon of milk to find its mass. You can then convert the volume of one gallon into cubic centimeters by using the conversion factor that one gallon is approximately equal to 3,785.41 cm³. Finally, divide the mass by the converted volume to obtain the density in grams per cubic centimeter (g/cm³).