Transcript Ch. 1.2 Measuring with Scientific Units

Ch. 1.2 Measuring with
Scientific Units
OBJECTIVES
Identify the base units used in the SI
system
Explain the use of Scientific Notation
Compare Volume, Mass, and Density
Measure Length, Mass, and Temperature
using SI units
Standards Addressed
S6a-Use tools to observe and measure
objects with appropriate precision &
accuracy
S4a-Big ideas and unifying concepts, such
as order and organization
Systèmé International (SI)
Base 10 system!!
See Table 1.2, page 11
– Length: meter
– Mass: kilogram
– Time: second
Volume
The amount of space that something occupies
SI unit is the cubic meter (m3)
Smaller volumes measured with the cubic
centimeter (cm3)
1 cm3 = 1 milliliter (ml)
Graduated cylinder measures liquid volume
Measure at the bottom
of the meniscus
Mass & Weight
Weight depends on gravity
Mass does NOT!!
Mass is the amount of matter (or STUFF)
in an object
SI unit of mass is the kilogram
Density
The amount of matter packed into a given
volume
Mass / volume
Units are grams / cm3
Density is a characteristic property of a
substance
Density of water is 1g / cm3
Why will these
objects sink
or float in water?
Temperature
Measure of heat energy
Measured with a thermometer
SI temperature scale is Celsius
Water freezes at 0° C (32° Fahrenheit)
Water boils at 100° C (212° Fahrenheit)
Time
SI unit is the second
1 millisecond = ?
1/1000 of a second
60 sec = 1 minute
60 minutes = 1 hour
24 hours = 1 day
365 days = 1 year
How many seconds in an hour?
How many hours in a year?
Scientific Notation
Is there an easier way to write
23,000,000,000,000,000,000?
YES!!!!
Step 1: Make the number between 1 and 10 by
placing the decimal to the proper “ new position”
Step 2: Write the “new” number, followed by
“
x 10n ”
Step 3: Count the number of places the decimal point
moved from its original position to its new position
Step 4: Put the number of places moved in place of
the “n” (This is called an exponent)