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# DO NOW - PowerPoint PPT Presentation

DO NOW. How are SI units of measurement different from other units of measurement we use in the US (such as feet, gallon, miles, pounds etc.)? What are the SI units of measurement for: Length Volume Mass Time Temperature 3. What tools or devices are used to make measurements: Length

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DO NOW

• How are SI units of measurement different from other units of measurement we use in the US (such as feet, gallon, miles, pounds etc.)?
• What are the SI units of measurement for:
• Length
• Volume
• Mass
• Time
• Temperature
• 3. What tools or devices are used to make measurements:
• Length
• Volume
• Mass
• Time
• Temperature

Taking a step back…

• SI system uses prefixes so scientists do not have to write a lot of decimal places and zeros

For example, compare:

Thickness of a strand of hair: .00009m

Thickness of a page: .0001m

Distance from here to China: 11,000,000 meters

• Scientists convert, or change, SI units to smaller or larger units using factors (or ratios)

Let’s focus on these two concepts for the rest of the period…

Using prefixes in measurements
• Prefixes hold places of decimals and zeros

Example, the prefix kilo- holds the place of three 0’s in 1000 base units

1 kilometer = 1000 meters

The prefix centi- holds two places after the decimal point in .01 base units

1 centimeter = .01 meter

The prefixes are…

kilo- hecto - deca- [base unit] deci- centi- milli-

Larger Smaller

Symbols for the prefixes are:

k- h- da- [b. u. abbv.] d- c- m-

When writing measurements, the first letter stands for the prefix, the second letter stands for the unit of measure

Example, kL = kiloliter, mm = millimeter

Let’s practice!!!!

Write out the units of measurement for the following:

Ex. mm = millimeter

1) mL 2) dag 3) dL 4) hm 5) dg 6) hL 7) kg

Abbreviate the following units of measurements:

Example: cm = centimeter

1) hectometer 2) decagram 3)milliliter

4) decigram 5) kilometer 6) centimeter

CONVERTING between units.

1. Moving decimal places:

Example: convert 275 kg to ____g

kilo- hecto - deca- [base unit] deci- centi- milli-

Moved three prefixes to the right from kilogram to grams, move three decimal places to the right

275.000 kg = 275000g

Let’s Practice! Moving decimals!

kilo- hecto - deca- [base unit] deci- centi- milli-

Covert the following units as indicated:

1) 232m = 2.32 hm 2) 4.24 km = 4240 m

3) .039m = 39 mm 4) 923 dam = 9230 m

5) 2.3m = 230 cm 6) 239 dm = 23.9 m

CONVERTING between units

2. Using conversion factors:

GIVEN x CONVERSION FACTOR = UNKNOWN

Conversion factors are determined using relationship between the units involved.

Example: 1 millimeter = .001 meter

Conversion factors are the ratios of the units involved

Example: 1millimeter.001meter

.001meter 1 millimeter

CONVERTING between units

2. Using conversion factors:

GIVEN x CONVERSION FACTOR = UNKNOWN

Example: 3.89 dag = 38.0 g

Relationship between units: 1 dag = 10 g