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International System of Units 3.2
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© Copyright Pearson Prentice Hall
The International System of Units
> Learning Target
I can convert measurements using the metric prefixes.
I can express numbers in correct scientific notation.
I can use significant figures and rounding to reflect the certainty of data.
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The International System of Units
> Vocabulary
SI systemMeterLiterKilogramWeightTemperatureCelsius scaleKelvin scaleAbsolute zeroCalorieJoule
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The International System of Units
> Measuring with SI Units
Measuring with SI Units
Which five SI base units do chemists commonly use?
3.2
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The International System of Units
>3.2 Measuring with SI Units
All measurements depend on units that serve as reference standards. The standards of measurement used in science are those of the metric system.
The International System of Units (abbreviated SI, after the French name, Le Système International d’Unités) is a revised version of the metric system.
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The International System of Units
>3.2 Measuring with SI Units
The five SI base units commonly used by chemists are the meter, the kilogram, the kelvin, the second, and the mole.
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The International System of Units
>3.2 Units and Quantities
Units and Quantities
What metric units are commonly used to measure length, volume, mass, temperature and energy?
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The International System of Units
>3.2 Units and Quantities
Units of Length
In SI, the basic unit of length, or linear measure, is the meter (m). For very large or and very small lengths, it may be more convenient to use a unit of length that has a prefix.
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The International System of Units
>3.2 Units and Quantities
Common metric units of length include the centimeter, meter, and kilometer.
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The International System of Units
>3.2 Units and Quantities
Units of Volume
The SI unit of volume is the amount of space occupied by a cube that is 1 m along each edge. This volume is the cubic meter (m)3. A more convenient unit of volume for everyday use is the liter, a non-SI unit.
A liter (L) is the volume of a cube that is 10 centimeters (10 cm) along each edge (10 cm 10 cm 10 cm = 1000 cm3 = 1 L).
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The International System of Units
>3.2 Units and Quantities
Common metric units of volume include the liter, milliliter, cubic centimeter, and microliter.
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The International System of Units
>3.2 Units and Quantities
The volume of 20 drops of liquid from a medicine dropper is approximately 1 mL.
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The International System of Units
>3.2 Units and Quantities
A sugar cube has a volume of 1 cm3. 1 mL is the same as 1 cm3.
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The International System of Units
>3.2 Units and Quantities
A gallon of milk has about twice the volume of a 2-L bottle of soda.
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The International System of Units
>3.2 Units and Quantities
Units of Mass
The mass of an object is measured in comparison to a standard mass of 1 kilogram (kg), which is the basic SI unit of mass.
A gram (g) is 1/1000 of a kilogram; the mass of 1 cm3 of water at 4°C is 1 g.
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The International System of Units
>3.2 Units and Quantities
Common metric units of mass include kilogram, gram, milligram, and microgram.
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The International System of Units
>3.2 Units and Quantities
Weight is a force that measures the pull on a given mass by gravity.
The astronaut shown on the surface of the moon weighs one sixth of what he weighs on Earth.
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The International System of Units
>3.2 Units and Quantities
Units of Temperature
Temperature is a measure of how hot or cold an object is.
Thermometers are used to measure temperature.
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The International System of Units
>3.2 Units and Quantities
Scientists commonly use two equivalent units of temperature, the degree Celsius and the Kelvin.
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The International System of Units
>3.2 Units and Quantities
On the Celsius scale, the freezing point of water is 0°C and the boiling point is 100°C.
On the Kelvin scale, the freezing point of water is 273.15 kelvins (K), and the boiling point is 373.15 K.
The zero point on the Kelvin scale, 0 K, or absolute zero, is equal to 273.15 °C.
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The International System of Units
>3.2 Units and Quantities
Because one degree on the Celsius scale is equivalent to one kelvin on the Kelvin scale, converting from one temperature to another is easy. You simply add or subtract 273, as shown in the following equations.
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The International System of Units
>3.2 Units and Quantities
Conversions Between the Celsius and Kelvin Scales
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SAMPLE PROBLEM
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3.4
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SAMPLE PROBLEM
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3.4
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SAMPLE PROBLEM
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3.4
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SAMPLE PROBLEM
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3.4
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Practice Problems
Problem Solving 3.17 Solve Problem 17 with the help of an interactive guided tutorial.
for Sample Problem 3.4
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The International System of Units
>3.2 Units and Quantities
Units of Energy
Energy is the capacity to do work or to produce heat.
The joule and the calorie are common units of energy.
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The International System of Units
>3.2 Units and Quantities
The joule (J) is the SI unit of energy.
One calorie (cal) is the quantity of heat that raises the temperature of 1 g of pure water by 1°C.
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The International System of Units
>3.2 Units and Quantities
This house is equipped with solar panels. The solar panels convert the radiant energy from the sun into electrical energy that can be used to heat water and power appliances.
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Section Quiz
-or-Continue to: Launch:
Assess students’ understanding of the concepts in Section
3.2 Section Quiz.
3.2.
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3.2 Section Quiz.
1. Which of the following is not a base SI unit?
a. meter
b. gram
c. second
d. mole
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3.2 Section Quiz.
2. If you measured both the mass and weight of an object on Earth and on the moon, you would find that
a. both the mass and the weight do not change.
b. both the mass and the weight change.
c. the mass remains the same, but the weight changes.
d. the mass changes, but the weight remains the same.
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3.2 Section Quiz.
3. A temperature of 30 degrees Celsius is equivalent to
a. 303 K.
b. 300 K.
c. 243 K.
d. 247 K.
END OF SHOW
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