rb measurement

Accuracy and Precision

• Accuracy refers to the closeness of measurements to the correct or accepted value of the quantity measured

• Precision refers to the closeness of a set of measurements of the same quantity made the same way

​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

Grade 8 Science Ohio | Lesson 2.1

​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​

    • 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