1. Chapter 4
Measurement

2. Monday Accuracy, precision, dimensional analysis
Foldable on Metric System

3. TEK to be covered
2 (F)  collect and organize qualitative and quantitative data and make measurements with accuracy and precision using tools and equipment;

4. Units of Measurement
Before 1795, measurement units were inexact!!!!

5. Units of Measurement
In 1960 the metric system was updated and is called the Systeme Internationale d’Unites or the SI unit of measurement.
Standard units of measurement for ALL scientists to use worldwide.

6. Base Unit - unit of measurement based on an object or event in the physical world
The standard kilogram is stored in a vault at the International Bureau of Weights and Standards near Paris. It is made of a platinum-iridium alloy, and is shown here next to an inch-based ruler for scale.

7. Base Units:
2. Time: second (s)
3. Length: meter (m)
4. Mass: kilogram (kg)

8. Derived Unit - A unit that is a combination of base units.
There are hundreds of units needed for measuring “everything,” but they are all derived from those base units.

9. Volume = L x W x H for a regularly shaped solid
cubic meter (m3),cubic centimeter (cm3) or cubic decimeter (dm3)
Unit for volume: liter (L) for a liquid
1 dm3 = 1 L cm3 = 1 mL

10. How reliable are measurements?
Accuracy – how close a measured value is to an accepted value
Precision – how close a series of measurements are to each other
Compare to throwing darts bottom of pg 36.

12. ACCURACY VS. PRECISION:
THIS CLOCK is more precise than THIS CLOCK
HOWEVER, if the actual time is 3:00, then the second clock is more accurate than the first one.
ACCURACY = HOW CLOSE A MEASUREMENT IS TO THE TRUE VALUE
PRECISION = EXACTNESS

13. Metric Units
The metric system is based on the decimal system, in which numbers are expressed in units of ten.

14. Metric Mnemonic King Henry Died Monday Drinking Chocolate Milk Kilo
Hecto
Deca
Base unit
Deci
Centi
milli

15. Measuring Length
When measuring length, use a metric ruler or meter stick.
Millimeters arte generally the smallest divisions represented

16. Measuring Volume Liquids are best measured using a graduated cylinder
Cooks use:
Measuring spoons and measuring cups

17. Measuring temperature
Temperature is measured in degrees Celcius in the metric system
To ensure accurate measurement of temperature, ensure that the bulb is completely immersed in the container

18. Measurement Equivalence for Solids
1 tablespoon (tbsp) = 3 teaspoons (tsp) 1/16 cup (c) = 1 tablespoon 1/8 cup = 2 tablespoons 1/6 cup = 2 tablespoons + 2 teaspoons 1/4 cup = 4 tablespoons 1/3 cup = 5 tablespoons + 1 teaspoon 3/8 cup = 6 tablespoons 1/2 cup = 8 tablespoons 2/3 cup = 10 tablespoons + 2 teaspoons 3/4 cup = 12 tablespoons 1 cup = 48 teaspoons 1 cup= 16 tablespoons

19. Measurement Equivalence for Liquids
8 fluid ounces (fl oz) = 1 cup 1 pint (pt) = 2 cups 1 quart (qt) = 2 pints 4 cups = 1 quart 1 gallon (gal) = 4 quarts 16 ounces (oz) = 1 pound (lb) 1 milliliter (ml) = 1 cubic centimeter (cc)

20. Tuesday
Measurement Lab

21. Worksheet
Practice over metric conversion

22. Thursday
Review worksheet

23. Friday Test over the metric system
Start notes on classification of matter
pure substance and a mixture: homogenous and heterogenous mixtures (using a venn diagram), solutions, colloids