1. Science
Basic Measurements

2. Accuracy and Precision
Accuracy is how close your measurement is to the actual value.
Precision is how close your measurements match each other.

3. D

4. Distance or Length
This nickel is 2.7 cm

5. This slide is 7.7 cm

6. or is it?
7.6 cm, always read with your eye perpendicular to the measurement.

7. Volume
When measuring with a graduated cylinder the measurement is read perpendicular to the graduated cylinder at the bottom of the curve of the liquid called the meniscus.

8. Mass
Record the measurement as displayed.
Digital
balances

9. Lab Time!!!!! Divide up into three equal sized groups.
Each group will work at each station.
When complete we will compare and contrast measurements within and between the groups.

10. International System of Units
Aka, The Metric System.
Based on multiples of 10.

11. First let’s multiply and divide by multiple of 10.

12. 2.5 X 10 =
2.5 X 10 = 25
0.75 X 1000 =
0.75 X 1000 = 750
3.0 X 100 =
3.0 X 100 = 300

13. 350/10 =
350/10 = 35
150/100 =
150/100 = 1.5
103/1000 =
103/1000 = 0.103

14. Money Our monetary system is mostly based on multiples of 10.
1000>100>10>1>0.10>0.01>0.001
Check out these wonderful EXAMPLES!

15. 0.001
0.01
X 10 =

16. 0.01
0.10
X 10 =

17. 0.10
1.00
X 10 =

18. ___________________
X 10

19. X 10
_____________________

20. ____________________
X 10

21. That was EASY and so is the metric system.

22. Prefixes
Prefixes are used to change from one multiple of 10 to the next in the metric system.
We don’t measure tiny objects with large units or large objects with tiny units.

24. Everyday Metric Prefixes
WHOA! That’s a lot of prefixes.
But don’t be afraid, only a few are used in everyday common measurements.
Everyday Metric Prefixes
kilo hecto deka base deci centi milli

25. Putting it all together
7 Base metric units and abbreviations:
meter (m)
second (s)
Kilogram (kg)
Ampere (A)
Kelvin (K) or Celsius C
Mole (mol)
Candela (cd)

26. Once again, only a few are used in everyday life.
Meter (m) to measure length.
Kilogram (kg) to measure mass.
Liter (L) , a derived unit, to measure volume.
Seconds (s) to measure time.
Kelvin (K) and Celsius C to measure temperature.

27. Here’s a meter stick!

28. It takes 10 decimeters to make up 1 meter.

29. It takes 10 centimeters to make up 1 decimeter.

30. If 1 meter = 10 decimeters and 1 decimeter = 10 centimeters then how many centimeters make up 1 meter?

31. That’s right! 10dm/1m X 10 cm/1dm = 100 cm

32. If 1 meter = 10 decimeters and 1 decimeter = 10 centimeters and 1centimeter = 10 millimeters then how many millimeters make up 1 meter?

33. That’s right! 1 m = 10 dm/1 m X 10 cm/1 dm X 10 mm/1 cm which = 1000 mm

34. It’s the same for mass and volume
1 kg = 10 hg = 100 dag = 1000 g 1 L = 10 dL = 100 cL = 1000 mL

35. Is it now obvious that the SI or metric system is easier than the English system of units?

36. You must simply multiply or divide by a multiple of 10 to change from one size unit to another size unit.

37. Remember
“All things are difficult before they are easy” ~Thomas Fuller