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### Metric System Primer

### 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” 1/100th of meter
- Millimeter – “mm” 1/1000th 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, 000,000 (length of a molecule

Average arrow: 29 inches, or .74 m (740mm)

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 1/000,000th of a meter and that a mm is 1/1000th 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 2Kg ( close to 5 lbs)
- My poodle weighs almost 6KG
- Milli; 1/1000th, so a mg is 1/1000 g, a medicine dosage might be 400 mg for IBU
- Micro, 1/1000,000th, so 100 µg is ____ mg
- move decimal to the ____ by ____ places
- (some bio toxins, Cbot, concentrations are measured in µg)

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 1ml is equal to .001L
- Convert 350 ml to Liters. Ans: ____ L
- Move decimal to the ____by ____ places
- Micro – 1/1000,000, 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)

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 X5/9

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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