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You can use Calculus to figure it out, but that's a lot of work.

A more simple approach is to:

# mass it (in grams)

# dunk it into a pitcher of water, and record how much liquid it displaces (in mL = cm^3)

# take (1), divide (2) # if the number is less than 1 it floats, and if the number is greater than 1 it sinks

Explanation:

* Density is defined as mass/volume, so to figure out the density of an object, find it's mass and it's volume, and divide the two. * To mass something is kind of like weighing it, but with different units. If something weighs 1 pound it's mass might be about 450 grams, depending on where you are. * An easy home-approach to finding volume of ex. a rock would be to find how much liquid it displaces. Take a measuring beaker that measures mL and fill it with ex. 500 mL of water, then insert your rock. Let's say the water level rose to 550 mL, that means your rock's volume is 50 mL. 1 mL = 1 cm^3 * So lets say your rock weighed 150 grams (about 5 ounces), and the water moved up 50 cm^3, so the rock's mass is 150g/50cm^3 = 3 g/cm^3 * Water's density is about 1 g/cm^3, so this rock's density is about 3 times as much as water! (I guess we just proved why rocks don't float!)

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16y ago

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To calculate the density of an irregular object like a rock, you can measure its mass using a scale and then determine its volume using the water displacement method. Once you have the mass and volume, you can divide the mass by the volume to obtain the density of the rock.


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