Post on 01-Jan-2016
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Chapter 1Chapter 1Lesson 3 Lesson 3 (cont.)(cont.)
““How to Use the S.I. System” How to Use the S.I. System”
IntroductionIntroduction
mg
Prefix Unit measured
milli gram
I. LengthI. Length
A. Def – the distance between 2 points
1. base unit = meter
2. Examples
a. meter, millimeter, hectometer
Length ExampleLength Example
Convert:
a. 5.0032 meters cm
= 500.32 cm
b. .0034 km mm
= 3400 mm
c. 4567 dm decameters
= 45.67 decameters
II. Volume II. Volume (derived unit)(derived unit)
A. Def. – the amount of space occupied1. formula: length X width X height2. base unit = liter (liquids); meter (solids)
a. **1 cm3 = 1 ml** 3. solids are always cubed (cm3, m3)4. for liquids, use container
dimensions to calculate volume5. is a derived unit which means it is
obtained by combining SI units
Volume ExampleVolume Example
A liquid is poured into a container. If the dimensions of the container are 45 ml, 54 ml, and 80 ml what is the volume of the liquid in ml3?
194,400 cm3
The sides of a box are 45 cm, 54 cm, and 0.4 dm. What is the volume of the box in cm3?
9,720 cm3
III. MassIII. Mass
A. Def. – the amount of matter in an object
1. base unit = gram
2. kilograms is used frequently
3. ex: golf ball vs. table tennis ball
Mass ExampleMass Example
Convert:
a. 54 g kg
.054 kg
b. 3.002 kg mg
3,002,000 mg
IV. Density IV. Density (derived unit)(derived unit)
A. Def. – Mass per unit of volume
1. formula: density = mass / volume
2. derived unit of mass and volume
Density ExampleDensity Example
What is the density of an unknown metal that has a mass of 178.0 grams and a volume of 20.0 mL?
***Remember D=M/V***
8.9 grams/mL
Will this object float in water??? (1.0 g/ml)
V. Time and TemperatureV. Time and Temperature
A. Def. – Time is the interval between two events.
1. Base unit = second
B. Def. – Temperature is the amount of heat contained in a substance
1. Base unit = Kelvin/Celsius
Temperature ScalesTemperature Scales
a. Celsius Scale – used for most scientific worki. 0 = freezing point of waterii. 100 = boiling point of wateriii. 20 = room temperatureiv. 37 = body temperature
b. Kelvin scalei. 0 on the Kelvin Scale is absolute zero (-273 C.)ii. to convert Celsius to Kelvin add 273 Kiii. to convert Kelvin to Celsius subtract 273 K
Temperature ExampleTemperature Example
The outside temperature is 29 degrees Celsius. What is it in Kelvin?
302 Kelvin
A person has a temperature of 313 Kelvin. Does this person have a fever?
yes; the body temp is 40 deg C.