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					Measuring


  The Metric System
  Lesson 4
Measuring
 Objectives
Measuring (Lesson 4)
The Metric System

Journal

1.   What are the ways we use the metric system?
Measuring (Lesson 4)
The Metric System

The base units
 the meter for distance,
 the kilogram for mass,
 the newton for weight,
 the second for time,
 the kelvin for temperature,
 The liter for volume
 the ampere for electric current,
 the mole for amount of substance, and
 the candela for intensity of light.
Measuring (Lesson 4)
The Metric System

Length

Definition: It is the distance between two points.

The meter is the SI unit of length.
Measuring (Lesson 4)
The Metric System

Weight versus Mass

Why don’t we use weight to measure mass?

    Mass: measures the amount of matter in an object.
1.   Kilogram is the SI unit for mass.
2.   (One liter of water has the same mass of about 1 kg)

    Weight is a measurement of force. The SI unit for weight is
     the newton (N).
1.   It depends on gravity, which can change depending on where
     the object is located.
2.   If you were on the moon would your weight change? Would
     your mass?
Measuring (Lesson 4)
Triple beam balance

www.explorelearning.com
Measuring (Lesson 4)
The Metric System

Volume

Definition: It is the amount of space an object occupies.

The cubic meter is the SI unit of volume, and or Liter.
1 liter = 1 kilogram
1000 liters = 1 ton
Measuring (Lesson 4)
The Metric System

Volume By Immersion

Not all objects are completely cubic. So how do we
   measure their volume.
Immerse them in water and see how much water is
   displaced.
Measuring (Lesson 4)
The Metric System

Temperature

This relates to how hot or cold an object is. Or how fast
   the particles, that make up a certain mass, are
   moving (kinetic energy).
Temperature is measure in SI with the Kelvin (K) scale.
 Measuring (Lesson 4)
 Temperature Scales




Boiling water   100 C   373 K   212 F


Freezing water 0 C      273 K   32 F




Absolute zero -273 C    0K      -459.4 F
Measuring (Lesson 4)
The Metric System

Activity:

Make a hodometer and measure the school.

Make a scale drawing of the school.
Measuring (Lesson 4)
The Metric System

Review
1. What is a base unit of measuring?
2. What do we measure with the metric
   system?
3. What is length, mass, weight, and volume?
   And what is their base unit of
   measurement?
4. Why are there different scales of
   measuring temperature?

				
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posted:3/27/2012
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