Measurement-A Common Language

1. Measurement-A Common Language EQ: How do I define mass, weight and density?

2. Mass • The measure of the amount of matter an object contains • Matter: The material that all objects and substances are made up of • Anything that has mass and takes up space is matter EQ: How do I define mass, weight and density?

3. Units of Mass • International System of Units • Abbreviated as SI after its French name Systeme International • The basic unit of mass in the SI system is the kilogram. EQ: How do I define mass, weight and density?

4. Milligrams • Used to measure smaller objects such as a paper clip EQ: How do I define mass, weight and density?

5. Conversions EQ: How do I define mass, weight and density?

6. Mass Measuring Mass

7. How does a triple-beam balance work? • A triple-beam balance works by comparing the mass of the object you are measuring to a known mass • When you use a triple-beam balance, you: • Place the object on the pan • Shift the riders on the beams until they balance the mass of the object • Start with the large rider (increments of 100) • Next, the medium sized rider (increments of 10) • Lastly, the small rider (increments of 1) EQ: How do I define mass, weight and density?

8. Mass The Difference Between Mass and Weight

9. Weight • The measure of the force of gravity acting on an object EQ: How do I define mass, weight and density?

10. How would your weight differ if you were to travel to the moon? • If you were to travel to the moon your weight would be less. • Your weight would be lesser because the force of gravity is less. • Weight is a factor of the force of gravity EQ: How do I define mass, weight and density?

11. Why would your mass stay constant if you were to travel to the moon? • Your mass would stay the same if you were to travel to the moon because mass is the amount of matter that an object contains • Since you are still made up of the same amount of “stuff”, your mass would not change EQ: How do I define mass, weight and density?

12. Why use the mass of an object instead of its weight? • mass does not change when the force of gravity does EQ: How do I define mass, weight and density?

13. Volume • The amount of space an object takes up EQ: How do I define mass, weight and density?

14. Liter (L) –used to measure the volume of a liquid. • Milliliter (mL) - To measure the volume of smaller liquids EQ: How do I define mass, weight and density?

15. The instrument used to measure the volume of liquids is called the… • Graduated cylinder. EQ: How do I define mass, weight and density?

16. This instrument has markings that are in increments of… • 1 milliliter (mL) EQ: How do I define mass, weight and density?

17. Meniscus • The curve in the top surface of water in the graduated cylinder EQ: How do I define mass, weight and density?

18. What is the proper way to read a meniscus? • Read the milliliter marking at the bottom of the curve EQ: How do I define mass, weight and density?

19. Volume of a solid object • To measure a solid objects that are regular shaped, a formula for volume can be applied • To measure a rectangular object such as a shoebox, multiply the object’s length, width, and height EQ: How do I define mass, weight and density?

20. The SI unit known for measuring solids with a larger volume is known as the… • Cubic meter (m³) - The SI unit used to measure solids with a larger volume EQ: How do I define mass, weight and density?

21. EQ: How do I define mass, weight and density?

22. The formula for calculating the volume of a rectangular object is: Volume = Length x Width x Height EQ: How do I define mass, weight and density?

23. Why is the unit cm³ used when calculating the volume of a rectangular object? • When multiplying the object’s length, width and height, the cm units are also multiplied cm x cm x cm = cm³ EQ: How do I define mass, weight and density?

24. Suppose a cereal box is 10 centimeters long, 4 centimeters wide, and 20 centimeters high. What would be the volume of the box? Volume = Length x Width x Height Volume = 10 cm x 4 cm x 20 cm Volume = 800 cm³ EQ: How do I define mass, weight and density?

25. Volume of an Irregular Solid • Water displacement method • To measure the volume of an irregular solid, immerse the object in water, and measure how much the water level rises EQ: How do I define mass, weight and density?

26. Steps for the water displacement method • Record the volume of water in the graduated cylinder • Carefully place the irregular solid into the water. Record the volume of the water plus the object • Subtract the volume of the water alone from the volume of the water plus the object EQ: How do I define mass, weight and density?

27. Density • The measure of how much mass is contained in a given volume • The density of a substance is the same for all samples of that substance. EQ: How do I define mass, weight and density?

28. The formula of density is: Density = Mass / Volume EQ: How do I define mass, weight and density?

29. Why is density expressed as a combination of two different units? • Because density is actually made up of two other measurements – mass and volume – an objects density is expressed as a combination of two units EQ: How do I define mass, weight and density?

30. Two Common Units For Density • Grams per cubic centimeter (g/cm³) • Grams per milliliter (g/mL) EQ: How do I define mass, weight and density?

31. Math Practice:What is the density of a wood block with a volume of 125 cm³ and a mass of 57 g? Density = mass / volume Density = 57 g / 125 cm³ Density = 0.46 g/ cm³ EQ: How do I define mass, weight and density?

32. Math Practice:What is the density of a liquid with a mass of 45 g and a volume of 48 mL? Density = mass / volume Density = 45 g / 48 mL Density = 0.94 g/mL EQ: How do I define mass, weight and density?

33. An object floats if it is less dense than a surrounding liquid. EQ: How do I define mass, weight and density?

34. If the bar of gold has a density that is greater than or less than 19.3 g/cm³, then the sample is not pure gold. How could you use density to determine whether a bar of metal is pure gold? EQ: How do I define mass, weight and density?

35. Will an object with a density of 0.7 g/cm³ float or sink in water? • An object that has a density of 0.7 g/cm³ will float in water (1 g/cm³) because it is less dense than water EQ: How do I define mass, weight and density?