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**The Metric System: Measuring Length**

7th Grade Earth Science The Metric System: Measuring Length Write Everything in Blue!!!

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History The metric system evolved over the years and in the 1960’s was named the International System of Measurement (SI for short). Scientific standards were set with the gram, meter, kelvin, second, ampere, candela, & in 1971 – the mole Ampere – electrical current candela measures light Mole – used in chemistry to measure the volume of elements

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**Advantages of Metric System**

No numbers to memorize Only 30 individual units Easy to say and write No fractions only decimals World standard Converts easily by multiples of 10.

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**Units of Measurement Examples: Kilometer Hectometer Decameter Meter**

Prefixes and Multiplier: Kilo = 1000 Hecto = 100 Deca = 10 Meter/Gram/Liter = 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. Other units of length and their equivalents in meters are as follows: 1 millimeter = meter 1 centimeter = 0.01 meter 1 decimeter = 0.1 meter 1 decameter = 10 meters 1 hectometer = 100 meters 1 kilometer = 1000 meters

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**Metric Length If you need to measure length, you use the “meter”**

If you need to measure longer lengths, you can use the kilometer Lets say you live 10 miles from school 10 miles = meters 16093 is a large number, so you can move the decimal 3 spots to make it 16.1 kilometers

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Abbreviations: We abbreviate these lengths as follows: 1 millimeter = 1 mm 1 centimeter = 1 cm 1 meter = 1 m 1 decimeter = 1 dm 1 kilometer = 1 km

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Examples: For reference, 1 meter is a little longer than 1 yard or 3 feet. It is about half the height of a very tall adult. A centimeter is nearly the diameter of a dime, a little less than half an inch. A millimeter is about the thickness of a dime.

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Who Does Not Use It? The only countries not to use the Metric System are the U.S., Myanmar, and Liberia

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**English to Metric Conversions**

39,370 inches = 1 kilometer feet = 1 kilometer .62 miles = 1 kilometer 39 inches = 1 meter 3.28 feet = 1 meter 1 inch = 254 mm 1 inch = 2.54 cm 1 foot = cm 1 yard = cm 1 yard = .914 m 1 mile = m 1 mile = km You do not need to know these. They are just for you to get an idea of how these systems compare.

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Comparisons

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Metric Measurements The 3 main measurements are the gram (weight), meter (length), & liter (volume)

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**Metric Prefixes These prefixes are based on powers of 10.**

What does this mean? From each prefix every “step” is either: 10 times larger or 10 times smaller For example Centimeters are 10 times larger than millimeters 1 centimeter = 10 millimeters

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**Metric Prefixes For each “step” to right, you are multiplying by 10**

For example, let’s go from a base unit to centi 1 liter = 10 deciliters = 100 centiliters 2 grams = 20 decigrams = 200 centigrams

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**Summary Summary Base units in the metric system are meter, liter, gram**

Metric system is based on powers of 10 For conversions within the metric system, each “step” is 1 decimal place to the right or left

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