Volume,Mass,Density

In Advance Science we did a water displacement test to find volume. We dunked Sarah into a trash can full of water. We filled 1000ml graduated cylinders with the water that fell out of the trash can. We came up with 54,520ml of water that was displaced, which means her volume was 54,520ml. There are many errors in this experiment. Some of them such as human errors, water spilling form the cups, not exact measuring in the beakers were some of the bigger errors.

Precision- As close as you can get with the tool you are using.
Accuracy- How close you are to being right.

We also did a candy bar density experiment. Our job was to take three different candy bars of one type of candy and measure the mass and volume. To get the volume I measured Length,width, and height. We did this by using a ruler to measure each side, and trying to get the least air as possible. You label your data as Cm3. To find the mass you place it on a balance. You label this data as G.After figuring all of the mass and volume measurements, you find the density. Density is Mass/Volume. After doing this equation for each one you label it G/Cm3. We then take the three measurements add them together and divide by three. This gives you the average of the density. From here you have to decide weather the candy bar can float in water. Water has a density of 1gG/Cm3. Now there was several mistakes in this experiment. First off there was still air in the candy bar, which made it harder to measure, also we might of not been as exact.
This is an example why a candy bar would sink.

This example shows a candy bar floating because it has a higher density(Tennis Balls) than the water.
Here is another example of density

This shows density because the red liquid is less dense than the green, more more dense then the white. The white and purple liquids have a relatively close density so it it drooping.