1. How Do We Measure Matter? Return to Table of Contents 1

2. We have previously defined the amount of matter ­ or the amount of "stuff" ­ as its mass. Mass is measured in grams (g) or kilograms (kg).(1 kg = 1,000 g*) Mass "kilo" = 1,000 2

3. Many times we use the words weight and mass interchangeably (or we use them to mean the same thing). However, this is wrong! Can you remember what the difference is between weight and mass? Talk about it with your partner. Weight vs Mass 3

4. Weight is the measure of the force of gravity on an object. Weight is measured in pounds (lbs) or Newtons (N). On Earth, all objects are attracted to the center of Earth by the force of gravity. The force of gravity can be more or less on the Moon or on other planets, depending on their sizes. Weight 4

5. On the other hand, the amount of matter (stuff) in an object does not change with the object's location. While your weight (gravitational force) may change if you travel to the moon, the mass (amount of "stuff") in your body does not change. This is because the gravity on the moon is much less than it is on Earth. Why is this? Therefore, the weight of an object changes with its location. Weight vs Mass 5

6. 7A person's mass on Earth would be when they go to the moon. A more B less C the same Answer 6

7. 7A person's mass on Earth would be when they go to the moon. A more B less C the same Answer 7

8. 8A person's weight on Earth will be compared to when they travel to the moon. A more B less C the same Answe r 8

9. 8A person's weight on Earth will be compared to when they travel to the moon. A more B less C the same Answe r 9

10. 9Objects weigh less on the moon than they do on Earth because the moon has less. A mass B gravity C.both A & B are correct D.neither A nor B are correct Answer10

11. 9Objects weigh less on the moon than they do on Earth because the moon has less. A mass B gravity C.both A & B are correct D.neither A nor B are correct Answer11

12. The amount of 'space' that matter occupies is called its volume. Volume is measured in milliliters (mL) and cubic centimeters (cm³). 1 milliliter (mL) = 1 cubic centimeter (cm 3 ) Volume12

13. To find the volume of a regular, box­shaped object you can measure its sides and multiply its measurements: Volume =(length) x (width) x (height) Measurements have units so you also multiply the units. Units = (cm) x (cm) x (cm) = cm³ Calculating Volume of Regular Objects h l w13

14. 10 What is the volume of a solid which has a length of 8 cm, a width of 4 cm and a height of 2 cm? Answer14

15. 10 What is the volume of a solid which has a length of 8 cm, a width of 4 cm and a height of 2 cm? Show your work. Answer15 V = l x w x h V = 8cm x 4cm x2cm V = 64cm 3

16. 11 How many cubic meters of dirt would it take to fill in a swimming pool that measured 18 meters long, 6 meters wide and 2 meters deep? A 216 m B 26 cm C 216 m 3 Answer16

17. 11 How many cubic meters of dirt would it take to fill in a swimming pool that measured 18 meters long, 6 meters wide and 2 meters deep? A 216 m B 26 cm C 216 m 3 Answer17

18. To find the volume of an irregular object you will need a graduated cylinder. Calculating Volume of Irregular Objects18

19. Volume of the diamond 1.Pour water into a graduated cylinder.Record the amount of water. 2.Place the object into graduated cylinder. 3.Record measurement of water level after the object was submerged. 4.Subtract original water level from ending water level. To find the volume of this object:19

20. Example: The volume of the water was 30 mL. After dropping the diamond into the graduated cylinder, the total volume increased to 46 mL. 46 mL ­ 30 mL = 16 mL The volume of the diamond is 16 mL. Volume of the diamond Calculating Volume of Irregular Objects20

21. 12An irregular object is dropped into a graduated cylinder containing 30 mL of water. After the object is added, the water in the cylinder measures 55 mL. What is the volume of the irregular object? A.85 mL B.25 mL C.25 cm D.55 mL Answer21

22. 12An irregular object is dropped into a graduated cylinder containing 30 mL of water. After the object is added, the water in the cylinder measures 55 mL. What is the volume of the irregular object? A.85 mL B.25 mL C.25 cm D.55 mL Answer22

23. Lab: Measuring Matter In this lab, you will demonstrate your ability to measure the mass and volume of various objects.You will need to find the volume of both regular and irregular objects!23