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# measurement - PowerPoint PPT Presentation

measurement . -a way to describe the world with numbers Answers questions: how much? How long? How far? Describe the amount; cost; distance; volume; mass; how fast; age Information described with numbers. Estimation . Helps you make a rough measurement of an object by guessing

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## PowerPoint Slideshow about ' measurement ' - nevaeh

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Presentation Transcript

• -a way to describe the world with numbers

• Answers questions: how much? How long? How far?

• Describe the amount; cost; distance; volume; mass; how fast; age

• Information described with numbers

Chapter 2 Vocabulary/Notes

• Helps you make a rough measurement of an object by guessing

• Based on experience

• Useful when you are in a hurry and exact data is NOT required

• Improve with experience, practice, and understanding

Chapter 2 Vocabulary/Notes

• You can compare an object whose length you don’t know to familiar objects

• Often use the word “about”

• Also used to check that an answer is reasonable

• 1 m = about height of a door knob above the floor

• 1 mm = about the thickness of a dime

Chapter 2 Vocabulary/Notes

• Describes how carefully you make your measurement

• The tool used determines the precision of the measurement

• The more improved the tool the more précised the measurement

• Can be reproduced or copied

Chapter 2 Vocabulary/Notes

• Compares a measurement to the real value

• The more accurate the measure, the closer it is to the true value

Chapter 2 Vocabulary/Notes

• Not all measurements must be measured with great precision

• 1. Look at the digit to the right of the place being rounded

• The digit remains the same if the digit to the right is 0, 1, 2, 3, or 4

• Round up if the digit to the right is 5, 6, 7, 8, or 9

2. The remaining digits to the right of the rounding place are eliminated from the rounded answer if it is a decimal

Chapter 2 Vocabulary/Notes

• Means International System of Units

• Established in 1960

• General system for measurement

• To avoid confusion, scientists use this common language

• Worldwide standard of physical measurement for industry, science, and commerce

• Uses units such as meters, cubic meter, grams, and Kelvin

• Uses multiples of 10

• To convert between units you multiply or divide by powers of 10

Chapter 2 Vocabulary/Notes

• Distance between two points

• Use the meter unit to measure

Chapter 2 Vocabulary/Notes

• Amount of space an object occupies

• Cubic meter (cm3) is used

• Formula: Volume=length x width x height or V = l x w x h or V = (l)(w)(h)

• Liquid volume is measured using liter

• 1 cm3 = 1 mm of water

Chapter 2 Vocabulary/Notes

• Measures the amount of matter in an object

• Uses kilogram unit

• 1 L of water = 1 kg

• Use a pan balance to measure

• Pan balance compares an object to a known mass; it is balanced when the masses on both sides are equal

• Depends on the amount of matter in an object

• NEVER changes

• Mass and weight ARE NOT the same

Chapter 2 Vocabulary/Notes

• Measurement of force

• Depends on gravity

• Can change depending on where the object is located

• Spring scale measures weight; the reading on the scale depends on the force pulling the spring

Chapter 2 Vocabulary/Notes

• Measures how hot or cold an object is

• In SI it is measured with the Kelvin (K) scale

• Measured also in Fahrenheit or Celsius

• 273 K = 0°C = 32°F (freezing point of water)

• 373 K = 100°C = 212°F (boiling point of water)

• Zero Kelvin is the coldest temperature possible in nature

Chapter 2 Vocabulary/Notes

• interval between two events

• Measured in seconds (s) or hours (h)

Chapter 2 Vocabulary/Notes

• A ratio of two measurements with different units

• Example: speed-distance traveled in a given time

• Measured in kilometers per hour (km/h)

• Are combinations of units Examples: grains/liter; °C/hour

Chapter 2 Vocabulary/Notes

• Shows an object exactly as it is

• Movie show can be slowed down or speeded up

Chapter 2 Vocabulary/Notes

• Can show important things and leave out unimportant details

• Illustrations

• Can show things we can’t photograph

• Can show hidden things

• sketches

Chapter 2 Vocabulary/Notes

• Organized way to collect and display data

• Displays info in rows and columns so it’s easier to understand

Chapter 2 Vocabulary/Notes

• Show the relationships between the data

• Used to collect, organize and summarize data in a visual way

• Can display one set of data or more

• Three common types: -line graphs -bar graphs -circle graphs

Chapter 2 Vocabulary/Notes

• Has two variable (something that can change or vary)

• Used to show the relationship between two variables

• Both variables must be numbers

• Has a vertical axis and a horizontal axis (bottom line)

Chapter 2 Vocabulary/Notes

• Uses bars to show the relationships between variables

• One variable MUST be a number; the other variable is divided into parts

Chapter 2 Vocabulary/Notes

• Shows the parts of a whole

• The circle represents the whole

• Sections represents the parts

• All the sections together equal 100 percent

Chapter 2 Vocabulary/Notes

• The way you mark the scale on a graph can create the wrong impression

• A broken scale (on the vertical axis) is used for small but significant changes

Chapter 2 Vocabulary/Notes