Measurements

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Measurements in Science
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Experimental measurements must not only be
RELIABLE and ACCURATE but also must be easily
understood by others
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a decimal system of measurement based on 10
metric system (SI)
Units of SI used in this class Kilo
1000 centi 1/100 or .01 deci 1/10 or
.1 milli 1/1000 or .001
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When Measuring Use length meters
(m) volume (lxwxh) liter (L) mass
grams (g) temperature Celsius (C)
Mass is a measure of amount of matter in an
object. Weight is measure of gravitational force
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centimeter
millimeter
1 meter100 centimeters (cm) 1 meter 1000
millimeters (mm) 1 cm 10mm
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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• length of the Mississippi River
• kilometer

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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• mass of a paper clip
• milligram

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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• mass of an elephant
• kilogram

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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• width of a fingernail
• millimeter

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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• width of a TV screen
• centimeter

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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• volume of juice in a paper cup
• milliliter

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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• mass of a bowl of cereal
• grams

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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• amount of salt in an order of french fries
• milligram

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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• amount of soda in a large plastic bottle
• liter

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centimeter kilometer milligram millimeter gram
kilogram Celcius meter liter milliliter

• temperature of a bowl of soup
• Celsius

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Density
is the mass of an object per unit volume (Dm/v).
The unit for density is a combination of more
than one fundamental unit and is therefore called
a derived unit
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The density of water is 1.0 g/mL

• If an objects density is greater than 1.0 g/mL
  will it sink or float?

SINK!
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Will a Diet Pepsi float or sink? Regular
Pepsi? What do you base your answer on?
What did you see? Were you correct in your
predictions? Why or why not?
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Problem
Do two candy bars have the same density?