Today, we started our two-week study on density. Density is the ratio of a material's mass to its volume. It can be calculated using the equation:
Density is not a new quantity that we are going to have to figure out how to measure. It is a relationship between two quantities we've already learned about; mass and volume. We practiced calculating the density of various liquids today. We did this by following these basic steps:
1) Place a graduated cylinder on a balance and hit the zero button.
2) Remove the graduated cylinder from the balance.
3) Transfer some of the unknown liquid into the graduated cylinder. (We are not concerned about getting a specific amount. We just need to have an accurate measurement.)
4) Record the volume of the liquid.
5) Place the graduated cylinder on the balance.
6) Record the mass of the liquid.
7) Use our density equation to calculate the density.
8) You're all done!
Once we had calculated densities for all of the liquids, we stacked them up in a large graduated cylinder. This is called a density column and I think it looks really neat!
Tomorrow, we will be working in small groups to make more density columns on your own.
Don't forget, if you are retaking the measurement quiz for next week, that needs to get done tomorrow. I'll be here before and after school as well as during advisory.
Here are the two videos I used to start class today. Enjoy!
Archimedes Lego Video http://www.youtube.com/watch?v=wEvtahSn_ms
Archimedes Explained http://www.youtube.com/watch?v=KMNwXUCXLdk
density = mass / volume
Density is not a new quantity that we are going to have to figure out how to measure. It is a relationship between two quantities we've already learned about; mass and volume. We practiced calculating the density of various liquids today. We did this by following these basic steps:
1) Place a graduated cylinder on a balance and hit the zero button.
2) Remove the graduated cylinder from the balance.
3) Transfer some of the unknown liquid into the graduated cylinder. (We are not concerned about getting a specific amount. We just need to have an accurate measurement.)
4) Record the volume of the liquid.
5) Place the graduated cylinder on the balance.
6) Record the mass of the liquid.
7) Use our density equation to calculate the density.
8) You're all done!
Once we had calculated densities for all of the liquids, we stacked them up in a large graduated cylinder. This is called a density column and I think it looks really neat!
Tomorrow, we will be working in small groups to make more density columns on your own.
Don't forget, if you are retaking the measurement quiz for next week, that needs to get done tomorrow. I'll be here before and after school as well as during advisory.
Here are the two videos I used to start class today. Enjoy!
Archimedes Lego Video http://www.youtube.com/watch?v=wEvtahSn_ms
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