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Equipment And

Measurement

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SI Units are...

InternationInternational al

StandardsStandards

Abbreviated SI from the French Le Abbreviated SI from the French Le Systeme Internationale d’UnitesSysteme Internationale d’Unites

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What is a standard?It is an exact quantity that people agree to use for comparison.Why are measurement

standards important?

A meter in the U.S. is the same as a meter in France, or China, or any other country in the world. This allows us to share data.

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Prefix Symbol Factor Number Factor Word

Kilo K 1,000 Thousand

Hecto H 100 Hundred

Deka DA 10 Ten

deci d 0.1 Tenth

centi c 0.01 Hundredth

milli m 0.001 Thousandth

Prefixes

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centi- meter

milli-liter

kilo-gram

(0.01)

(.001)

(1000)

Putting It All Together…

hundredth of a meter

thousandth of a liter

thousand grams

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SI Units for Measurement Used in Science

Length

Volume

Mass

Temperature

Measured in meters (m)Measured in meters (m)

Measured in Liters (L)Measured in Liters (L)

Measured in grams (g)Measured in grams (g)

Measured in degrees Celsius (Measured in degrees Celsius (OOC)C)

Metric ruler

Graduated cylinder

Balance

Thermometer

Type Base Unit Tool

Time Measured in seconds (s)Measured in seconds (s) Clock

L x W x H

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Metric Conversions

Base

Unit

Kilo1000

Hecto100

Deca10

deci.10

centi.01

milli.001

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Let’s Practice…….

36 cm = ___ m

28 mL = ____ L

5.25 m = _____ mm

480 mg = ____ g

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When measuring an object with a ruler,

never start with at the “0” mark. Rulers are less accurate due to wear and tearwear and tear at the ends. Begin at the 2, 4, 5 or 6 cm mark

in order to get the most accurate mark.

Using a Ruler

The red line would be 1.2 cm1.2 cm because the “5” is the starting point.

What is the length of the red line? 6.2 cm or 1.2 cm

5 6

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Reading the Meniscus

When measuring liquid volume in a graduated cylinder, a meniscus often forms where the liquid ends.

graduated cylinders

In order to read this liquid volume, you must be at “eye-level” to the level of the liquid.You take the reading at the BOTTOMBOTTOM

of the meniscus.The liquid level is 36.5 mL.

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Read these liquid volumes in mL:

11.5 mL76.0 mL

A. B.