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Metric System

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Metric System

- 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)

- Measured with a graduated cylinder, by water displacement, or by equation
- Mass-technically a measure of matter, but here on Earth it is the same thing as weight
- Measured with a triple-beam-balance

- The metric system is based on a base unit for each measurement
- Length = meter
- Volume = liter
- Mass(Weight) = gram
- Temperature = Celsius
- Time = seconds

- Example:
- Centi + meter = Centimeter

- The three prefixes that we will use the most are:
- kilo
- centi
- milli

- These prefixes are based on powers of 10.
- From each “step” is either:
- 10 times larger
or

- 10 times smaller

- 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

- 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)

- 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

- Now let’s try from meters to kilometers:
16000 meters =

1600 decameters

160 hectometers

16 kilometers

- 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

- Celsius Scale is based on water
- The freezing point of water is 0OC
- The boiling point of water is 100OC

- The equations to convert between Fahrenheit and Celsius are:
°F = (1.8 x °C) +32

°C = (°F-32) x 0.555

- 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 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