Metric System

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# Metric System - PowerPoint PPT Presentation

Metric System. Measurements. Length-measure of distance Measured with a yard stick or ruler Volume-measure of how much space an object takes up Measured with a graduated cylinder, by water displacement, or by equation cube volume=length X width X height (LXWXH)

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### Metric System

Measurements
• Length-measure of distance
• Measured with a yard stick or ruler
• Volume-measure of how much space an object takes up
• Measured with a graduated cylinder, by water displacement, or by equation
• cube volume=length X width X height (LXWXH)
• Mass-technically a measure of matter, but here on Earth it is the same thing as weight
• Measured with a triple-beam-balance
Metric System
• The metric system is based on a base unit for each measurement
• Length = meter
• Volume = liter
• Mass(Weight) = gram
• Temperature = Celsius
• Time = seconds
• Prefixes plus base units make up the metric system
• Example:
• Centi + meter = Centimeter
Metric System
• The three prefixes that we will use the most are:
• kilo
• centi
• milli
Metric System
• These prefixes are based on powers of 10.
• From each “step” is either:
• 10 times larger

or

• 10 times smaller
Why 10 times larger?
• Units that are 10 times larger or smaller are easier to convert.

1 centimeter = 10 millimeters

40

41

40

41

1 cm

Metric System
• For each “step” to right, you are multiplying by 10

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)

Metric System
• An easy way to move within the metric system is by moving the decimal point one place for each “step”

1 meter = 10 decimeters = 100 centimeters

or

1.00 meter = 10.0 decimeters = 100. centimeters

Metric System
• Now let’s try from meters to kilometers:

16000 meters =

1600 decameters

160 hectometers

16 kilometers

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
Temperature
• Celsius Scale is based on water
• The freezing point of water is 0OC
• The boiling point of water is 100OC
Temperature Conversion
• The equations to convert between Fahrenheit and Celsius are:

°F = (1.8 x °C) +32

°C = (°F-32) x 0.555

Example
• If it is 80°F outside, what is the temperature in °C?

°C = (°F-32) x 0.555

°C = (80-32) x 0.555

°C = (48) x 0.555

°C = 26.6

Density
• Density is calculated by dividing the mass of an object by the volume.

Density = Mass/Volume

• For example 1mL of water has a mass of 1g.

Density = Mass/Volume

Density = 1g/1mL

Density = 1g/mL

• Objects with a density less than 1g/mL will float in water and objects with a density greater than 1g/mL will sink in water