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Scientific Scientific MeasurementMeasurement77thth Grade Science Grade ScienceMr. LiggettMr. Liggett
Why is measurement so Why is measurement so important in science?important in science?
Measurement in science can come in many Measurement in science can come in many different forms. All these measurements give different forms. All these measurements give us different ways to describe what we see.us different ways to describe what we see.
Measurements are ACURATE and PRECISEMeasurements are ACURATE and PRECISE
Which statement is more useful?Which statement is more useful?
The rock is big OR the rock is 13.9 grams The rock is big OR the rock is 13.9 grams
Explain your reasonExplain your reason
How can we measure How can we measure things?things?
We can measure distance (how far apart is We can measure distance (how far apart is it?)it?)
We can measure area and volume (how much We can measure area and volume (how much space does it take up?)space does it take up?)
We can measure mass (how much matter We can measure mass (how much matter does it have?)does it have?)
We can measure density (how tightly packed We can measure density (how tightly packed is the matter?)is the matter?)
What tools can we use What tools can we use to measure?to measure?
Rulers and Tape Measurers (distance, area Rulers and Tape Measurers (distance, area and volume)and volume)
Graduated Cylinder (volume of liquids, Graduated Cylinder (volume of liquids, density)density)
Triple Beam Balance (mass)Triple Beam Balance (mass)
Self-Check #1Self-Check #1
Why is measurement so Why is measurement so important in science?important in science?
What are some ways that What are some ways that we can measure things?we can measure things?
What types of tools can we What types of tools can we use to measure objects?use to measure objects?
DistanceDistance
How would you describe distance?How would you describe distance?
Distance is the amount of space in Distance is the amount of space in between two points on a straight line.between two points on a straight line.
How do we measure How do we measure distance?distance?
Tool: Ruler, Tape Measurer, Meter Tool: Ruler, Tape Measurer, Meter StickStick
Label: ALWAYS USE METRIC Label: ALWAYS USE METRIC (millimeter, centimeter, meter)(millimeter, centimeter, meter)
Measuring Tips: Measuring Tips: DistanceDistance
Remember, distance is the length from one point Remember, distance is the length from one point to another. Always put the zero on the first to another. Always put the zero on the first point.point.
BE CAREFUL, some rulers have a zero that does BE CAREFUL, some rulers have a zero that does not start on the end.not start on the end.
PerimeterPerimeter
Perimeter is the distance AROUND and object.Perimeter is the distance AROUND and object.
To find perimeter, simply add up the sides of To find perimeter, simply add up the sides of an object (P= 2l + 2w)an object (P= 2l + 2w)
Try it out!Try it out!
AreaArea
Area is the amount of space INSIDE a 2D Area is the amount of space INSIDE a 2D object (Think about the space on a floor)object (Think about the space on a floor)
Area Formula A = l x w (Area equals Area Formula A = l x w (Area equals length times width)length times width)
All area labels must be squared.All area labels must be squared.
For example: a rectangle with For example: a rectangle with centimeters (cm) must have an area of centimeters (cm) must have an area of centimeters squared (cmcentimeters squared (cm22))
Area: Try It Out!!Area: Try It Out!!
VolumeVolume
What is volume?What is volume?
Volume is the amount of space in a 3D objectVolume is the amount of space in a 3D object
Any object that is 3D has a volumeAny object that is 3D has a volume
Volumes can come in solids, liquids and gases Volumes can come in solids, liquids and gases
What units are used to What units are used to measure volumemeasure volume
Liquid volumes are usually Liquid volumes are usually measured in liters or millilitersmeasured in liters or milliliters
Another way to measure volume Another way to measure volume is through cubic measurements is through cubic measurements (m(m33, cm, cm33) )
Think of it this way, volumes are Think of it this way, volumes are 3D3D, so you used the raised , so you used the raised 33
How can I measure How can I measure volume?volume?
If the object is a regular solid, you If the object is a regular solid, you can use the following formula: can use the following formula: Volume equal length times Volume equal length times width times heightwidth times height
V = l x w x h (V=lwh)V = l x w x h (V=lwh)
Just like area, except it has a 3Just like area, except it has a 3rdrd dimension dimension
Try it out!!Try it out!!
What if the volume is a What if the volume is a liquid?liquid?
If the volume is a If the volume is a liquid, we need to use liquid, we need to use a tool like the a tool like the graduated cylindergraduated cylinder
Simply look for the Simply look for the water line, we call it water line, we call it the the meniscusmeniscus
It looks like this ---------It looks like this ---------