The Metric System.pptx

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SCIENCE SKILLS

LAB SAFETY AND LAB NOTEBOOK

The following power point was adapted from Ryan P. Murphy. A full collection of his amazing power points can be found at:

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Why Use The Metric System?

• _{The English system is a poor system of}

measuring

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“You must

unlearn what

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“The Old English System is

not stronger, It is based off

of the number 12 instead of

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Disadvantages of the English System

• _{English System only}

works with human size type things.

• _{Doesn’t work for really}

large or really small objects.

• _{The metric system is}

better for measure

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“Now the Metric System we

will learn. Based off of the

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“Unwise the Old English

System is, Use the Metric

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• _{The countries colored in}_red_{are the ones that}

don’t use the metric system.

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The United States

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The United States

Liberia, No

official

system of

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The United States

Liberia, No official

system of

measurement

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• _{Even England uses the metric system over the}

Old English System that we use.

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Scientific Tools

1. Graduated Cylinder 8. Electronic Balance 2. Erlenmeyer Flask 9. Dissecting Pan

3. Beaker 10. Slides and Coverslips

4. Test Tubes 11. Microscope

5. Test Tube Brush 12. Petri Dishes 6. Funnel 13. Not Pictured -

Thermometer

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Metric Measurement

• _{Capacity: the amount that can be measured}

with an instrument

• _{Range: is the low value up to the high value}

• _{Numbered Increment: the value represented by}

each of the numbered lines on the instrument

• _{Unnumbered Increment: the value represented}

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Scientific Measurement: Metric System

Some Properties we measure:

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Measuring Length

The numbered lines are in centimeters and have a value of 1 cm each.

The unnumbered lines are millimeters. Each

unnumbered line is worth 1 mm or .1 cm

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Mass

• _{Mass is the amount of matter in an object}

• _{Weight is force of gravity}

• _{Mass and weight are the same on Earth}

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Measuring Mass

• Triple Beam Balance and Electronic Balance

• _{Measure in grams}

• _{Usually 3 sets of numbered}

increments (100 g, 10 g, 1 g)

• _{The bottom rider has the}

unnumbered increments (usually .1g)

• _{http://www.wisc-online.com/ob}

jects/index_tj.asp?objID=GCH20 2

• _{When determining the capacity}

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Volume

• _{3 dimensional space an object}

occupies

• _{Volume is space that matter}

occupies – anything that has mass and takes up space

• _{SI unit is the liter}

• _{Density is how much mass is}

contained in a given volume

– _Mass/volume

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Measuring Volume

• When using the graduated cylinder,

we measure in milliliters (ml).

• Pay close attention the value of the numbered and unnumbered lines. • The cylinder at the top is 80, 90,

100. Thus there are 10 increments in between the numbers. The value of the numbered increments is 10 ml.

• The cylinders on the bottom go up by 1’s and 5’s. Thus the value of the numbered increments is 1 ml and 5 ml.

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Unnumbered Increments

• In the top cylinder there are 9 unnumbered lines in

between the numbered increments. The value of each unnumbered line is 1 ml.

• _{Both cylinders on the}

bottom have 4 unnumbered lines in between the

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Temperature

• Measure in degrees C

• _{Has negative numbers} • O degrees = freezing

• 100 degrees = boiling

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In the metric system, you can measure the

very small and the very large with the

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• _{You can measure the very small and the very}

large with the same unit. (Meter)

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• _{You can measure the very small and the very}

large with the same unit. (Meter)

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• _{How many millimeters are in 5.3 meters?}

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• _{IMAX Cosmic Voyage}

• _{Link to the Powers of 10 portion of video.}

– _{http://www.youtube.com/watch?v=qxXf7AJZ73A}