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**Measurement – A Common Language**

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The Metric System The metric system is a decimal system of weights and measures. It is based on the unit of length called the METER. The metric system is now called, The International System of Measurement (SI for short). To get the meter, they divided a line from the north pole to the equator into 10 million parts!

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**Why do we use Metric System**

No numbers to memorize Easy to say and write Converts by multiples of 10 Used all around the world

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**Units of Measurement Prefixes: Examples: Kilometer Hectometer**

Deca = 10 (Base Unit)= 1 Deci = .1 Centi = .01 Milli = .001 Examples: Kilometer Hectometer Decameter (Meter) Decimeter Centimeter Millimeter

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**Length: The standard unit of length in the metric system is the meter.**

Common length units: 1 millimeter = 1 mm 1 centimeter = 1 cm 1 meter = 1 m 1 kilometer = 1km

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**Let’s look at the meter:**

1 meter is a little longer than 1 yard or 3 feet. There are 10 decimeters in 1 meter There are 10 centimeters in 1 decimeter. There are 10 millimeters in 1 centimeter Measuring length – p. 48 The shell of the turtle in figure 2 is 8.8 cms, how many mms is this?

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**English to Metric Conversions**

****You do not need to know these. 1 inch = 2.54 cm 1 foot = cm 1 yard = .914 m 1 mile = m 1 mile = km 39,370 inches = 1 kilometer feet = 1 kilometer .62 miles = 1 kilometer

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Let’s Practice Use the meter stick or the metric ruler to measure the following: careful when choosing what unit to measure in… 1. the length of your lab table 2. the length of your science textbook 3. the length of your partners hand 4. the length of your own pinky finger 5. the width of your pinky finger nail 6. the width of your pencil point

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**Mass Mass is a measure of how much matter an object contains.**

The basic unit for mass is kilogram. How many grams = 1 kg? In the science lab, we will measure in grams. But…. what is a gram?

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**The difference between**

MASS and WEIGHT Weight = the force of gravity on an object. Mass = the amount of matter an object contains 120lbs on Earth = 20lbs on the moon 50 kgs on Earth = 50 kgs on the moon

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Measuring Mass Triple Beam Balance – a device for measuring mass in grams. Let’s learn the parts of the triple beam balance and practice measuring mass. Desktop text p. 49

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**TIME The SECOND is the standard SI unit used to measure time.**

There are 60 seconds in 1 minute. There are 60 minutes in 1 hour.

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**Measuring Volume Volume - the amount of space an object takes up.**

**The standard unit for volume is the liter Volume of liquid = pour liquid into graduated cylinder and measure amount Volume of regular shaped solids = length x width x height in cms (cm3) Volume of irregular shaped solids (like a rock)= water displacement.

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**DENSITY Density = mass unit = g/cm3 volume = g/ml p. 52 Let‘s READ. **

p.53 Densities of common substances. Once you know an objects density, you can determine whether or not the object will float in a given liquid. Look at the chart, what is the density of water? Will Aluminum sink or float in water? Explain how you know

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**What is the density of a pencil with a volume of 4ml, and a mass of 24g?**

What is the density of an object with a volume of 12cm3, and a mass of 36g? Let’s find the Mass and Volume of our two wooden cubes… The density of water is 1g/cm3 or 1g/ml (1ml = 1cm3)

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