Metric System Primer Science uses the Metric system
- Slides: 17
Metric System Primer Science uses the Metric system units as it’s standard for reporting data. Knowing the basics of the Metric system is essential. To report data on: Length – the standard is the Meter Mass – the standard is the Gram Volume – the standard is the Liter Temperature – Degrees Celcius Time - Second
Metric System Primer • Length – Meter abbreviation “m” • 1 meter, 1 m – a length approximately 39 inches • (uses – 100 meter range in Olympic archery) • The meter is subdivided into smaller units using standard prefixes of a set value: – Kilo = 1000 - Km = 1000 meters (used to measure long distances, for example: Distance from home to RVS campus 8. 3 Km) Convert 8. 3 Km to m. 8. 3 X 1000 = 8300 meters • *** simple, just move the decimal place to the right 3 spaces, that is the same as multiplying by 1000 (Very easy – even for us Math impaired biologists)
Metric System Primer • (uses – 100 meter range in Olympic archery) too far for me
Metric System Primer • • Meter Ruler Divided into smaller more useful units Centimeter – “cm” 1/100 th of meter Millimeter – “mm” 1/1000 th of meter
Metric System Primer • Meter Ruler • Divided into even more smaller more useful units – Micrometer = micron, the µ symbol, Greek letter, 1/1000, 000 meter (length of a cell) – Nanometer = nm, 1/1000, 000 (length of a molecule
Metric System Primer Average arrow: 29 inches, or. 74 m (740 mm)
Metric System Primer • Relative size of things in Biology
Metric System Primer • You must be able to quickly convert from one metric length to another. It is easy; you only have to move the decimal place the appropriate number of places. • Example: A cell is 0. 005 mm long. What is its length in microns? Remember that a micron is 1/000, 000 th of a meter and that a mm is 1/1000 th of a meter. Which way do we move the decimal? How many places? • Move to the right, 3 places (same as multiplying by 1000) answer is 5. 0 microns. So, 5. 0 microns is equivalent to 0. 005 mm
Metric System Primer • The metric unit for Mass is the Gram; symbol “g”. This a small mass unit. A BB from your childhood Daisy Red Rider weighs about a gram. • Useful prefixes help. – Kilo; 1000, so a Kg is 1000 grams, a tea cup poodle might weigh only 2 Kg ( close to 5 lbs) – My poodle weighs almost 6 KG – Milli; 1/1000 th, so a mg is 1/1000 g, a medicine dosage might be 400 mg for IBU – Micro, 1/1000, 000 th, so 100 µg is ____ mg – move decimal to the ____ by ____ places – (some bio toxins, Cbot, concentrations are measured in µg)
The “Princess”
Metric System Primer • The metric system unit for volume is the Liter (not litter – that is for kittens) • A liter is a large volume (about a quart) • Useful prefixes help. – – Milli – 1/1000, so 1 ml is equal to. 001 L Convert 350 ml to Liters. Ans: ____ L Move decimal to the ____by ____ places Micro – 1/1000, µ, so 400 µl of alcohol is equivalent to ____ ml. – Move decimal to the ____by ____ places – (** don’t forget that 1. 0 ml of water is 1. 0 cc of water and actually has a mass of 1. 0 g)
Litter vs. liter
Metric System Primer • Temperature: In the metric system, temperature is given in degrees Celsius,
Metric System Primer • Temperature: In the metric system, temperature is given in degrees Celsius • Useful temperatures to memorize • Human body = 37 C (98. 6 F) • Water freezes at 0 C (32 F) • Water boils at 100 C (212 F) • Convert Temp from C to F = 1. 8 C +32 • Convert Temp from F to C = F-32 X 5/9
Ice – zero degrees C body temp – 37 degrees C boiling water - 100 degrees C
Metric System Primer • Metric standard unit for time is Second (s) • Ks = _______ seconds ms = ____ seconds • µs = ______seconds ns = _______ seconds I’ll give you some quiz questions on the metric system for practice in class.
Review questions on line • http: //www. austincc. edu/biology • Go to the anatomy and physiology prep. Link • Online Self-Prep Course for the Anatomy Assessment Test • Go to Metric system Module and review
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