1. In Science and Medicine, We use the Metric System!

2. Dimensions Unit of length: meter Unit of mass: gram
Unit of volume: liter

3. SI Base Units of Measurement
Mass = the gram; g
1 gram ≈ 1/28 ounce
Length = the meter; m
1 meter ≈ yard
Volume = the liter; l
defined as 1000 cubic centimeters
1 liter ≈ quart
Temperature = degrees Celsius; oC

4. Prefixes The metric system uses prefixes to represent units
smaller and larger than the fundamental unit by factors of 10.
For example, a centimeter is 1/100 of a meter, and a kilometer is 1000 times a meter
For very large numbers, we use the powers-of-ten notation, e.g. 102 = 100, 106 = 1,000,000, 10-2 = 0.01

5. Prefixes
One of the clever ideas behind the system was to use only multiples of ten.

6. Converting Between Metric Units
To convert from a LARGER unit of measure to a SMALLER unit of measure, MULTIPLY by the “order-of-magnitude difference” between the units.
Example: 1.2 mg = ______ g
1 mg = 1000 g
1.2 mg = 1.2 x 1000 g = 1200 g
Remember to check if your answer is logical.
It should take a GREATER NUMBER of SMALL UNITS to equate to a LESSER NUMBER of LARGE UNITS.
A microgram is smaller than a milligram (by a factor of 1000), so a given number of milligrams should be equal to many more micrograms (1000 times as many).

7. Converting Between Metric Units
To convert from a SMALLER unit of measure to a LARGER unit of measure, DIVIDE by the “order-of-magnitude difference” between the units.
Example: 250 ml = ______ l
1 l = 1000 ml
250 ml = 250 ÷ 1000 l = 0.25 l
Is your answer is logical?
It should take a LESSER NUMBER of LARGE UNITS to equate to a GREATER NUMBER of SMALL UNITS.
A liter is larger than a milliliter (by a factor of 1000), so a given number of milliliters should be equal to fewer liters (1/1000 as many).

8. Thinking in Metric Units of Length
1 kilometer = ~0.62 or ~5/8 mi
1 meter = 1.09 yard = 39.4 in
1 centimeter = ~4/10 inch
1 angstrom = 1/10 nm or 10-10m
1 mile = ~1.6 km
1 yard = ~0.91 m
1 foot ~30.5 cm
1 inch = ~2.54 cm

9. Thinking in Metric Units of Volume
1 liter = ~1.06 quart
1 milliliter = 1 cubic cm (1cc) ~"a thimble full"
Examples
1 teaspoon ≈ 5ml
12 oz. soda ≈ 360 ml
2-liter bottle of soda
1 gallon = ~3.8 l
1 quart = ~0.95 l
1 pint = ~0.47 l
1 cup = ~240 ml
1 fluid oz. ~30 ml
2 liters~1/2 gal.

10. Thinking in Metric Units of Mass
1 kilogram = 2.2 pounds
1 gram = ~"a thimble full" of water
Examples
70 kg human = 154 lbs.
1 ml of water weighs ~1 g
1 pound = 454 g
1 ounce = ~28 g

11. Estimate The length of: The volume of: The mass of: your bare foot
your driveway
The volume of:
a coffee cup
a bottle of shampoo
The mass of:
a steak
a dog

12. Celsius: The Metric Temperature Scale
Also called the centigrade scale.
Definitions
0 Celsius = 32 Fahrenheit = water freezes
100 Celsius = 212 Fahrenheit = water boils
Therefore, 1C = 1.8F
Conversions
 Celsius = 5/9 x ( Fahrenheit - 32)
 Fahrenheit = (9/5 x  Celsius) + 32
100C
212F
0C
32F

13. Thinking in Celsius -10 Celsius = frigid (14 F)
0 Celsius = cold (32 F)
10 Celsius = cool (50 F)
20 Celsius = comfortably warm (68 F)
30 Celsius = hot (86 F)
40 Celsius = very hot (104 F)
What would you wear outside in tempsf:
10C, 0C, 10C, 20C, 30C?