Presentation on theme: "The Metric System: Measuring Length"— Presentation transcript:
1 The Metric System: Measuring Length 7th GradeEarth ScienceThe Metric System: Measuring LengthWrite Everything in Blue!!!
2 HistoryThe 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 moleAmpere – electrical current candela measures lightMole – used in chemistry to measure the volume of elements
3 Advantages of Metric System No numbers to memorizeOnly 30 individual unitsEasy to say and writeNo fractions only decimalsWorld standardConverts easily by multiples of 10.
4 Units of Measurement Examples: Kilometer Hectometer Decameter Meter Prefixes and Multiplier:Kilo = 1000Hecto = 100Deca = 10Meter/Gram/Liter = 1Deci = .1Centi = .01Milli = .001Examples:KilometerHectometerDecameterMeterDecimeterCentimeterMillimeter
5 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 meters1 hectometer = 100 meters1 kilometer = 1000 meters
6 Metric Length If you need to measure length, you use the “meter” If you need to measure longer lengths, you can use the kilometerLets say you live 10 miles from school10 miles = meters16093 is a large number, so you can move the decimal 3 spots to make it 16.1 kilometers
7 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
8 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.
9 Who Does Not Use It?The only countries not to use the Metric System are the U.S., Myanmar, and Liberia
10 English to Metric Conversions 39,370 inches = 1 kilometerfeet = 1 kilometer.62 miles = 1 kilometer39 inches = 1 meter3.28 feet = 1 meter1 inch = 254 mm1 inch = 2.54 cm1 foot = cm1 yard = cm1 yard = .914 m1 mile = m1 mile = kmYou do not need to know these. They are just for you to get an idea of how these systems compare.
14 Metric Prefixes These prefixes are based on powers of 10. What does this mean?From each prefix every “step” is either:10 times largeror10 times smallerFor exampleCentimeters are 10 times larger than millimeters1 centimeter = 10 millimeters
15 Metric Prefixes For each “step” to right, you are multiplying by 10 For example, let’s go from a base unit to centi1 liter = 10 deciliters = 100 centiliters2 grams = 20 decigrams = 200 centigrams
16 Summary Summary Base units in the metric system are meter, liter, gram Metric system is based on powers of 10For conversions within the metric system, each “step” is 1 decimal place to the right or left