Is a decimal system based on 10

1
Metric System (SI)

• Is a decimal system based on 10
• Used in most of the world
• Used by scientists and hospitals

2
Metric Length

• The basic SI unit used to measure distance is the
  meter."The metre is the length of the path
  traveled by light in vacuum during a time
  interval of 1/299 792 458 of a second.

3
The more common SI measures of distance are

• Centimeter (cm) about the diameter of a dime
  corresponds to English inches.
• Millimeter (mm) about the thickness of a dime
  corresponds to English fractional inches.
• Meter (m) about 1 yard corresponds to English
  feet or yards.
• Kilometer (km) a little more than ½ mile
  corresponds to English miles.

4
Which metric unit (km, m, cm, mm) should be used
to measure each item?

• Thickness of sheet metal
• Length of an automobile race
• Length and width of a table top
• Thickness of plywood
• Length and width of a house lot

5
Fill in each blank with the most reasonable unit
(km, m, cm, mm).

• The diameter of a wheel on a 10-speed bicycle is
  56 ______.
• The width of a door in our house is 91 ___.
• Antonios waist size is 95 ______.
• Jan drives 16 _____ to school.
• The distance from home plate to the center field
  wall is 125 _____.

6
Mass and weight

• The words mass and weight are often used
  interchangeably, but technically they are
  different.The mass of an object is the quantity
  of material making up the object. The weight of
  an object is the measure of the pull of earths
  gravity on the object. For instance, the weight
  of an object decreases as it gets further away
  from earth, but its mass does not change.

7
The basic unit for measuring mass in the metric
system (SI) is the gram. The gram is a small unit
that is defined to be the mass of the amount of
water contained in a cube that measures 1 cm on
each side .A paper clip weighs about 1
gram.
8
A US cent weighs exactly 2.5 g, while the nickel
weighs exactly 5 g.
9
Fill in the blank with the most reasonable unit
(kg, g, mg, or metric ton).

• Elevators in the college have a load limit of
  2200 ______
• My new truck can haul a load of 3 _____
• I take 1 _____ of vitamin C each day
• A jar of peanut butter contains 1200 _____
• One common size aspirin tablet is 325 __

10
The metric unit used to measure extremely small
amounts such as dry medicine is the milligram. A
grain of salt has a mass of about 1 mg. Most
aspirin tablets contain about 100 mg of pure
aspirin.
11
The kilogram is used to measure the weight of
heavier objects that are measured in pounds in
the English system. A pair of shoes weighs about
a kilogram.
12
The metric ton is equal to 1000 kg and is used to
measure the weight of extremely large objects
that are measured in tons in the English system.
An English ton is 2000 pounds a metric ton is
about 2200 pounds.
13
1 liter of water weighs 1 kilogram, so 1 cubic
meter 1000 liters of water weighs 1000
kilograms or 1 metric ton.
14
Volume and AreaThe basic unit for measuring
liquid volume or capacity is the liter (L). It is
equal to the volume of a cube 10 cm (1 dm) on
each side, therefore
15
Which metric unit (kg, g, mg, or metric ton)
should you use to weigh the following

• A vitamin capsule
• A 4-wheel drive tractor
• Your mass
• A bag of potatoes
• An apple

16
A liter is slightly more than a quart,
Liter
Quart
17
Milk, soft drinks, and gasoline are sold by the
liter. Liquid medicine and eye drops are sold by
the milliliter.
18
Which metric unit would be used to measure
the following

• Cough syrup
• Size of a farm
• Piston displacement in an engine
• Paint needed to paint a house
• Page size in a book
• Gasoline in your car

19
Fill in the blank with the most reasonable
unit

• I drink 250 ___ of orange juice each day
• Bob planted 75 ___ of wheat this year
• We heat 520 ___ of living space in our house
• Our communitys water tower holds 650 _____ of
  water
• We should drink 2 ____ of water each day

20
Learning Check

• Identify the measurement in metric units.
• A. Johns height is
• 1) 1.5 yards 2) 6 feet 3) 2 meters
• B. The volume of saline in the IV bottle is
• 1) 1 liters 2) 1 quart 3) 2 pints
• C. The mass of a lemon is
• 1) 12 ounces 2) 145 grams 3) 0.6 pounds

21
Units in the Metric System

• length meter m
• volume liter L
• mass gram g
• temperature Celsius C

22
Other SI prefixes for smaller units
micro- (µ-) 10-6 1 millionth
nano- (n-) 10-9 1 billionth
pico- (p-) 10-12 1 trillionth
femto- (f-) 10-15 1 quadrillionth
atto- (a-) 10-18 1 quintillionth
zepto- (z-) 10-21 1 sextillionth
yocto- (y-) 10-24 1 septillionth
23
Learning Check

• Identify the measurement in metric units.
• A. Johns height is
• 1) 1.5 yards 2) 6 feet 3) 2 meters
• B. The volume of saline in the IV bottle is
• 1) 1 liters 2) 1 quart 3) 2 pints
• C. The mass of a lemon is
• 1) 12 ounces 2) 145 grams 3) 0.6 pounds

24
Solution

• A. Johns height is
• 3) 2 meters
• B. The volume of saline in the IV bottle is
• 1) 1 liter
• C. The mass of a lemon is
• 2) 145 grams

25
The following table can be used to convert one
metric unit to another.
kilo hecto deka basicunit deci centi milli
m
dam
dm
cm
mm
hm
km
Since we have meters, start in The meters column.
0.458
458 m ______ km
Go to the km column by moving 3 places to the left
Take the original decimal point and do the same
thing.
26
Change the following

• 450 cm _______m
• 3.2 km _______ m
• 1.4 m ________ mm
• 2.4 m ________ cm
• 48 cm ________ mm
• 12.3 dm ________ dam