Download presentation
Presentation is loading. Please wait.
Published byEvan Douglas Modified over 5 years ago
1
Metric System Review Scientists use the metric system to measure things such as volume, distance, and time. Meters, grams, seconds, degrees celsius,
2
Quantity Unit Symbol Length meter m Mass kilogram Kg Temperature Kelvin Celsius K C Time second s
3
Limits of Measurement You can only be as precise as the tools you use!
Precision is a gauge of how exact a measurement is. Precision is the degree to which several measurements provide answers very close to each other Ex. 5 mins is less precise that 5 min 45 sec Accuracy is the closeness of a measurement to the actual value of what is being measured. Ex. If a clock is running 15 mins slow, then the clock is not accurate
5
What tools measure what quantities
Mass Electronic balance, triple beam balance Volume Beaker, graduated cylinder, ruler Weight Spring scale Temperature Thermometer, temperature probe
6
THE METER The meter is the starting point for the metric system. START
7
Here’s a meter stick!
8
It takes 10 decimeters to make up 1 meter.
9
It takes 10 centimeters to make up 1 decimeter.
10
If 1 meter = 10 decimeters and 1 decimeter = 10 centimeters then how many centimeters make up 1 meter?
11
That’s right! 1 meter = 100 centimeters
12
100centimeters = 1 meter
13
It takes 10 millimeters to make up 1 centimeter.
Boy, that’s small!
14
If 1 meter = 10 decimeters and decimeter = 10 centimeters and 1centimeter = 10 millimeters then how many millimeters make up 1 meter?
15
That’s right! 1000 millimeters = 1 meter
16
It takes 10 millimeters to make up 1 centimeter.
Millimeters are so small that they almost run together.
17
Metric System These prefixes are based on powers of 10. What does this mean? From each prefix every “step” is either: 10 times larger or 10 times smaller For example Centimeters are 10 times larger than millimeters 1 centimeter = 10 millimeters kilo hecto deca Base Units meter gram liter deci centi milli
18
Metric System Centimeters are 10 times larger than millimeters so it takes more millimeters for the same length 1 centimeter = 10 millimeters Example not to scale 40 41 1 mm 40 41 1 cm
19
Metric System For each “step” to right, you are multiplying by 10
For example, let’s go from a base unit to centi 1 liter = 10 deciliters = 100 centiliters 2 grams = 20 decigrams = 200 centigrams ( 1 x 10 = 10) = (10 x 10 = 100) (2 x 10 = 20) = (20 x 10 = 200) kilo hecto deca meter liter gram deci centi milli
20
Metric System An easy way to move within the metric system is by moving the decimal point one place for each “step” desired Example: change meters to centimeters 1 meter = 10 decimeters = 100 centimeters or 1.00 meter = 10.0 decimeters = 100. centimeters kilo hecto deca meter liter gram deci centi milli
21
Metric System Now let’s try our previous example from meters to kilometers: 16093 meters = decameters = hectometers = kilometers So for every “step” from the base unit to kilo, we moved the decimal 1 place to the left (the same direction as in the diagram below) kilo hecto deca meter liter gram deci centi milli
22
Metric System If you move to the left in the diagram, move the decimal to the left If you move to the right in the diagram, move the decimal to the right kilo hecto deca meter liter gram deci centi milli
23
Metric System Now let’s start from centimeters and convert to kilometers centimeters = 4 kilometers centimeters = kilometers kilo hecto deca meter liter gram deci centi milli
24
Metric System Now let’s start from meters and convert to kilometers
4000 meters = 4 kilometers kilo hecto deca meter liter gram deci centi milli Now let’s start from centimeters and convert to meters 4000 centimeters = 40 meters kilo hecto deca meter liter gram deci centi milli
25
Metric System Now let’s start from meters and convert to centimeters
5 meters = 500 centimeters kilo hecto deca meter liter gram deci centi milli Now let’s start from kilometers and convert to meters .3 kilometers = 300 meters kilo hecto deca meter liter gram deci centi milli
26
Metric System Now let’s start from kilometers and convert to millimeters 4 kilometers = millimeters or 4 kilometers = 40 hectometers = 400 decameters = 4000 meters = decimeters = centimeters = millimeters kilo hecto deca meter liter gram deci centi milli
27
Metric System Summary Base units in the metric system are meter, liter, gram Metric system is based on powers of 10 For conversions within the metric system, each “step” is 1 decimal place to the right or left Using the diagram below, converting to the right, moves the decimal to the right and vice versa kilo hecto deca meter liter gram deci centi milli
28
This is a magnified image of a ruler/meter stick.
1 2 3 4 This is one centimeter.
29
This is a magnified image of a ruler/meter stick.
1 2 3 4 This is half of a centimeter.
30
This is a magnified image of a ruler/meter stick.
1 2 3 4 This is one millimeter.
31
This key measures 3 cm. 1 2 3 4
32
Or you could say that it measures 30 mm.
1 2 3 4
33
This key measures 2.5 cm. 1 2 3 4
34
Or, you could say that it measures 25 mm.
1 2 3 4
35
1 2 3 4 This toy car measures 4.2 cm.
36
Or, you could say it measures 42 mm.
1 2 3 4 Or, you could say it measures 42 mm.
37
Why is Scientific Notation Important???
Scientific notation makes it easier to work with very large numbers or very small numbers. For example: is written as 8.6 X 10-4 300,000,000 is written as 3.0 X 108
38
Now try these…. Write 3,564,000 in scientific notation.
Remember only one number in front of the decimal point!!!
39
Were you right? 3.564 X 106 4.3 X 10-3
41
54mm - ___m 13kL ____cL .54Dg _____mg
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.