# Metric Units (SI Units) - PowerPoint PPT Presentation

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Metric Units (SI Units). Measurements. Must have a number and a unit (Ex) 13 vs. 13 cm The number tells how much you have The unit tells what you are measuring (Ex) cm = length; g = mass; L = volume; J = energy; °C = temperature.

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Metric Units (SI Units)

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## Metric Units(SI Units)

### Measurements

• Must have a number and a unit

(Ex) 13 vs. 13 cm

• The number tells how much you have

• The unit tells what you are measuring

(Ex) cm = length; g = mass; L = volume; J = energy;

°C = temperature

### SI Units (≈metric units)(International System of Units)

• Notice the basic units have one letter.

• * All other units are derived units and have two letters or more.

### How to Use Prefixes

1 kg = 1000 g

1 cm = 0.01 m

1 mL = 0.001 L

1 Ms = 1000000 s

1 µL = 0.000001 L

Math Review

(1)

(Ex)

(2)

### Unit Conversion

• Conversion factors (CF)

1. always in fraction form

2. always equal to 1

(Ex)

3. More than 1 CF can be multiplied

4. Units are treated like variables

(Ex)

### Converting Units

(Ex) Convert 1.74 m to cm

(Ex) Convert 14.5 nm to mm.

### Practices

Convert the units

1) 592 cmto in

2) 8.5 L/min to gal/sec

3) 65 km/hr to mile/min