1.4 Metric System

Do Now:Make a list of metric

measurements and English Measurements

Scientific Measurements

Most scientist use the metric system (also known as the International System of Units, SI) when collecting data and performing experiments.

Why do you think we all use the metric system?

http://www.youtube.com/watch?v=DQPQ_q59xyw&feature=related

Metric ~vs~ English

Meter (m)Gram (g)Liter (L)

Celsius (°c)

Foot (ft) Yard (yd)

Pound (lb)Quart (qt)

Gallon (gal)Fahrenheit (F)

Temperature

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Chocolate Milk

Length

VolumeMass

Prefix MeansKilo (k) 1000 times

Hecto (h) 100 times

Deka (dk) 10 times

Deci (d) 0.1 times

Centi (c) 0.01 times

Milli (m) 0.001 times

Write the correct abbreviation for each metric unit.

1) Kilogram _____ 6) Liter _____

2) Meter _____ 7) Kilometer _____

3) Gram _____ 8) Centimeter _____

4) Milliliter _____ 9) Milligram _____

5) Millimeter _____ 10) dekameter _

Only 3 things YOU need to know for metric conversions:

1. You need to be able to count to 62. Know your left from your right3. King Henry Died Unexpectedly Drinking Chocolate

Milk

That’s it!X X

KILO1000Units

HECTO100

Units

DEKA10

UnitsDECI

0.1Unit

CENTI0.01Unit

MILLI0.001Unit

MetersLitersGrams

Ladder Method

How do you use the “ladder” method?

1st – Determine your starting point.

2nd – Count the “jumps” to your ending point.

3rd – Move the decimal the same number of jumps in the same direction.

4 km = _________ m

12

3

How many jumps does it take?

Starting Point Ending Point

4.1

__.2

__.3

__. = 4000 m

The decimal moves the same number of places as steps and in the same direction.

35 kg = _________cg

You jump 5 spaces to the right.So you move the decimal 5 spaces to the right!

3,500,000

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Chocolate Milk

Try these conversions using the ladder method.

1000 mg = _______ g 1 L = _______ mL 160 cm = _______ mm

14 km = _______ m 109 g = _______ kg 250 m = _______ km

Conversion Practice

Compare using <, >, or =.

56 cm 6 m 7 g 698 mg

1.0 1000 1600

14,000 0.109 0.250

600cm< 0.698g>

Metric worksheet http://www.youtube.com/watch?v=IhtgKHYZti0&NR=1&feature=endscreen

Try these conversions, using the ladder method.

10) 2000 mg = _______ g 15) 5 L = _______ mL 20) 16 cm = _______ mm

11) 104 km = _______ m 16) 198 g = _______ kg 21) 2500 m = _______ km

12) 480 cm = _____ m 17) 75 mL = _____ L 22) 65 g = _____ mg

13) 5.6 kg = _____ g 18) 50 cm = _____ m 23) 6.3 cm = _____ mm

14) 8 mm = _____ cm 19) 5.6 m = _____ cm 24) 120 mg = _____ g

Metric Conversion Challenge

Compare using <, >, or =.

25) 63 cm 6 m 27) 5 g 508 mg 29) 1,500 mL 1.5 L

26) 536 cm 53.6 dm 28) 43 mg 5 g 30) 3.6 m 36 cm

D. Temperature = degrees Celsius

1. Measures how much heat something contains

2. To convert from Fahrenheit to Celsius: 5/9 x (oF -32)

a.Determine the temperature in Fahrenheit

a.(Lets use 60oF as an example)

b. Using your calculator, subtract 32 c. Multiply the result times 5 d. Divide that answer by 9 e. Your final answer is the

temperature in Celsius (Our example: about 16 oC)

Celsius to Fahrenheit

9/5 (oC) + 32Try this one: Change 30 oC to

degrees Fahrenheit

Celsius to Fahrenheit

Answer: 86 oF

Try Some on Your Own!

Convert 75 oF to oC

Convert 40 oF to oC

30°C is hot,20°C is pleasing,

10°C is not,0°C is freezing.

III. Microscopes

A. We use light microscopesB. Also called compound microscopes (2

lenses)

1. this is why the images appear upside down and backwards

C. Electron Microscope – Uses electrons to produce images instead of light

1. can magnify 500,000 times2. uses a vacuum so specimens

are not alive

Types of Electron Microscopes

Scanning Electron Microscope (SEM)◦Produces 3-D image◦Electrons bounce off gold-coated specimen

Transmission Electron Microscope (TEM)◦Produces a 2-D image◦Electrons beam through specimen

The samples shown above are (clockwise from top left) an ant (Lasius flavus), passion fruit (Passiflora caerulea) pollen, a  freshwater shrimp parasite (Epistillis sp.), sunflower (Helianthus anuus) pollen and central, a greenbottle (Lucilia sericata) foot.