Materials:
* Rock: The irregular rock you want to measure.
* Scale: To measure the mass of the rock.
* Graduated Cylinder: A container with markings to measure the volume of water displaced.
* Water: Enough to submerge the rock.
Procedure:
1. Measure the mass:
* Place the rock on the scale and record its mass in grams (g).
2. Measure the volume:
* Fill the graduated cylinder: Pour water into the graduated cylinder until it reaches a convenient level. Record the initial volume (V1) in milliliters (mL).
* Submerge the rock: Carefully lower the rock into the graduated cylinder. Make sure the rock is fully submerged and no air bubbles are trapped.
* Record the new volume: Note the new volume (V2) of the water with the rock submerged.
* Calculate the volume of the rock: Subtract the initial volume (V1) from the final volume (V2) to get the volume of the rock (V): V = V2 - V1
3. Calculate the density:
* Formula: Density (D) = Mass (M) / Volume (V)
* Plug in your values: Use the mass you measured in step 1 and the volume you calculated in step 2.
* Result: The result will be in grams per milliliter (g/mL) or grams per cubic centimeter (g/cm³).
Example:
* Mass of rock = 50 grams
* Initial volume of water = 20 mL
* Final volume of water with rock = 35 mL
* Volume of rock = 35 mL - 20 mL = 15 mL
* Density of rock = 50 g / 15 mL = 3.33 g/mL
Important Notes:
* Make sure the rock is completely dry before weighing it.
* Be careful when lowering the rock into the graduated cylinder to avoid splashing or breaking the container.
* The accuracy of your measurements will affect the accuracy of your density calculation.
* If the rock is too large for the graduated cylinder, you can use a displacement method with a larger container and measure the volume of water displaced by the rock.
Let me know if you'd like to try an example calculation!
