1. Scientific Measurement

2. Making Measurements
Qualitative measurements: Give results in a descriptive and non-numerical form
Example: Cookie Monster is Blue
Quantitative measurements: Give results in a definite form – usually as numbers and units
Example: Cookie Monster ate 1 kg of cookies

3. Qualitative or Quantitative?
The Big Mac is $2.29.
The Pop Rocks are blue.
The coffee is hot.
The slurpee is 0 degrees Celsius.

4. Significant Figures
When we make quantitative measurements, we care about how good our data is.
How we do this? Significant figures
Slide 1 of 6

5. Significant Figures (Sig. Figs) in Measurements…
When you take measurement you know some number for certain…

6. International System of Units

7. Metric prefixes:
The metric system utilizes prefixes based on powers of 10.

8. Linear Measurements The length, width, or height of something
Tool: ruler, meter stick, etc.
Units:
Meter (m)
Centimeters (cm)
Millimeters (mm)

9. Study Question1:

10. Volume The space matter takes up
Tool: Graduated cylinder, beaker, etc.
Units:
Liter (L)
Milliliters (mL)
MUST BE EYELEVEL TO MEASURE CORRECTLY!

11. Study Question2:

12. Mass The quantity of matter Tool: balance, scale, etc. Units:
Kilograms (kg)
Grams (g)
We use digital scales…so just record what the scale says

13. Mass continued… Scale must read zero before you place anything on it!
If you want to measure the mass of something inside a container…you must measure the empty container first.
How much mass does the water have?
462.3 g
450.0 g

14. Temperature The amount of heat present Tool: thermometer Units:
Degrees Celsius (°C)

15. Study Question3