Mass, volume, density

Mass, Volume, Density

1. Mass, Volume, & Density What makes the ice cubes float in your water?

2. Mass of an Object Mass – Amount of matter in an object. *Reminder* Matter is a substance that takes up space.

3. Mass Mass is measured in grams. We will measure mass using a triple beam scale. Mass is constant and doesn’t change like weight (gravity).

4. Triple Beam Scale Make sure to start off zeroing the scale. To find mass: Go to biggest way and work your way down the scale to smallest until it is balanced.

5. Volume This is a measurement of the amount of space an object takes up or occupies. We will measure volume in the units of Millileters (mL) or cm^3.

6. Liquid Volume To measure our liquid we will use a graduated cylinder. *Tip* get on eye level with the liquid to take an exact measurement. Unit for liquid is mL

7. Solid Volume The unit we will use here is cm^3 mL=cm^3 Usually measured by L x W x H We will measure our ice in the graduated cylinder.

8. Density Density: 2 ways to view it 1. The mass of a substance per unit volume 2. How many particles there are in a area of space. Units: g/cm^3 or g/mL

9. Density equation Density is an objects ratio of its mass to volume. Mass:Volume Density= Mass/Volume.

10. Density Triangle How to use: 1. Cover up the term you are looking for. 2. Use the two other variables to find the one you are looking for. 3a. If they are beside each other then multiply. 3b. If one is on top of the other then divide it by the bottom one.

11. Density Example Mass of wool ball: 103 grams Volume of wool ball: 2000mL What is the density? Density = 103g/2000 mL Density = 0.05 g/mL

12. Density Example 2 A 275 g object occupies a volume of 250 mL. What is the density?

13. How to change Density We can either keep the mass the same and change the volume Or we can change the mass and keep the same volume

14. Change the Mass If we increase mass then we increase density If we decrease mass we decrease density Look at example below: Left has less mass and right has more mass.

15. Change the Volume Increasing the volume will decrease the density Decreasing the volume will increase the density. Look at example below: Left has increased volume and right has decreased volume.

16. Hmmm… So What makes your ice float?