1. MEASUREMENTS AND SCIENTIFIC TOOLS
LESSON 2

2. DESCRIPTIONS 2 TYPES OF DESCRIPTIONS
1. Quantitative- uses numbers to describe the observation. Ex. There are 3 dogs
2. Qualitative- uses your senses(sight, sound, smell, touch, taste) to describe an observation. Ex. The salty fries

3. INTERNATIONAL SYSTEM OF UNITS
Known as SI units
Derived fro seven base units.
Adopted by all scientists
Table 2
Prefixes: indicate a fraction or a multiple of the base unit
Prefixes are based on the powers of ten
Table 3

4. PRECISION VS. ACCURACY 4 out of 4 basketballs fall in the basket.
Accuracy is a description of how close a measurement is to an accepted or true value. -4 out of 4 basketballs hit the rim.
Precision is a description of how similar or close measurements are to each other.
4 out of 4 basketballs fall in the basket.

5. Scientific Tools Science Journal
Balances- triple beam balances, scales
Thermometer
Glassware
Compound Microscope
Computers
Magnifying Lens
Slide
Pipette
Dissecting Tools

6. Triple Beam Balances

7. Thermometer- measures temperature of substances
0⁰Celsius = 32⁰ Fahrenheit
1⁰Fahrenheit = ⁰ Kelvin

8. Graduated Cylinders Meaures volume – liquids
Meniscus – the lowest point of the “U” of the liquid

9. Beakers Must be on a flat surface to read the results.
Measures liquids
Must be eye level to read the results

10. Erlenmeyer Flasks
Mixing, measuring and storing liquids