To find the density of an apple, you would first measure its mass using a scale in grams. Next, you would determine the volume of the apple by either measuring its dimensions and calculating the volume of a sphere (if it's round) or by submerging it in water and measuring the water displacement. Finally, you would divide the mass of the apple by its volume to calculate the density in grams per cubic centimeter.
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D = M/V so you could get a measuring cup and fill it partway with water. Then put the apple in. Because apples float you will will have to hold the apple underwater with a toothpick or needle (this will slightly change your measurement). Measure the new place the water is at. This is the volume (in ml). Then to find the mass you will have to weight the apple. Divide mass by volume and you'll have your answer in grams/milliliters.
calculate density of sponge ?
Mass = Density -------- volume
Density = Mass/Volume.
Density = mass/volumeMass = (density) x (volume)Volume = mass/density
Multiply them: density*volume = mass