Scientific Measurement and SI Units

​Science Root of the Day:

DO NOW: Infer what the example words mean in your lab manual.

Extra Credit: Find three additional words that use this root and write them and their definition in your lab manual (6 Points Max)

Lesson 2.1 Scientific Measurement

Tallest or deepest?

It is a misconception that the tallest structure in the world must be built on land. Until 2008, the worlds tallest structure was the Petronius Compliant Tower, built on the Ocean Floor. Measuring 610 meters tall, this Oil Platform held the title until 2010, when the 828 meter high Burj Khalifa took the title of the tallest building in the world!​

Multiple Choice

A controlled Experiment

• Introduces Bias

• Tests several variables at once

• Tests one Variable and has limited bias

• changes no variables

​Why Use a Standard Measurement System?

• If everyone measured using their own system, we would not be able to understand how people came to different values

  • If one person measures using the length of their foot and another uses the length of their hand, it is hard to compare

• Modern Scientists Use the SI System to keep measurements the same no matter where you are​

​The SI System Uses Metric

• The Metric System: a standard measurement system based on the number 10

  • Allows scientists to compare data and communicate with each other

  • Uses different units for different types of measurements

    • Meter

    • Liter

    • Gram

  • Prefixes tell you how many of each unit there are

SI Prefixes

• Sometimes, we measure things that are very large or very small and want to simplify what we are looking at

  • Do you want to write out 10,000 grams or 10 Kilograms?

• We can a simplify our numbers using metric prefixes

  • Based on increases and decreases by a factor of 10

Fill in the Blank

How many meters are in a Kilometer

Fill in the Blank

How many centimeters are in a meter

Fill in the Blank

How many meters are in a dekameter

Reorder

Rank the prefixes from largest to smallest

• Kilo-

• Hecta-

• deci-

• centi-

• milli-

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Fill in the Blank

A picnic blanket is 1 meter across. and ant is 1 centimeter in length. How many ants would fit end to end across the picnic blanket?

Fill in the Blank

nickel weighs 5 grams. How many milligrams does it weigh?

​Length

• Length: the distance from one point to another

  • Base Unit is the meter

    • 1 meter=100 centimeters

    • 1000meters= 1 kilometer

Grade 8 Science Ohio | Lesson 2.1

Mass Vs. Weight

• Mass: the amount of matter within an object

  • Unless you do something to change an object, it's mass doesn't change​

    • The Base Unit is Grams

    • We tend to measure in Kilograms in the metric system

      • Small objects use grams

• Weight: The force of gravity acting on an object

  • SI base unit is the Newton

  • Can change depending where you are in the universe

Grade 8 Science Ohio | Lesson 2.1

​Volume

• Volume: the amount of space an object takes up

  • For regular shapes :Calculated by multiplying Length x Width x Height

  • For Irregular Shapes: Calculated in a lab using a displacement method

  • Units include

    • Centimeters Cubed: cm³

    • Meters Cubed: m³

    • Liters: L

Grade 8 Science Ohio | Lesson 2.1

​Density

• Density: the amount Mass in a given volume

  • D=m/v

  • Is always the same, no matter how much of something you have

  • Water has a Density of 1.0

    • anything less dense than water will float

Grade 8 Science Ohio | Lesson 2.1

Multiple Select

Look at the chart and select all the materials that will float in water

• Gold

• Corn Oil

• Ethanol

• Corn Syrup

• Table Sugar

​Time

• The SI Unit for time is seconds

  • Measured with a stop watch​

  • Divided into smaller units like milliseconds

Grade 8 Science Ohio | Lesson 2.1

​Temperature

• A measure of energy of particles in motion

  • When particles are moving quickly, heat is created and the temperature rises

• Base unit is Kelvin (K)

  • Starts at 0 and moves up

  • We will use celsius in this class because thats what our thermometers and probes read​

Grade 8 Science Ohio | Lesson 2.1

Multiple Choice

Density is a measure of how much __________ is in a certain volume

• Mass

• Temperature

• Time

• Length

Multiple Choice

There are 1000 meters in a _________

• Kilometer

• Millimeter

• Centimeter

• Decimeter

Multiple Choice

An objects mass would be less on the moon where there is no gravity

• False

• True

• Sometimes