Transcript Document

Introduction to
Chemistry
for Allied Health Sciences
Measurements and Units
Kirk Hunter
Chemical Technology Department
Texas State Technical
Unit 1.2 College Waco
Measurements
and Units
Measurement
• A number with UNITS
– inches, pound, quart
– centimeter, gram, milliliter
Measurement
• Length - meter
• Volume - liter
• Mass – gram
• Time – second
• Temperature - Celcius
Mass
• Mass - amount of matter
• Measured with a balance.
– A Balance is not affected
by the earth’s gravity.
Mass
• Mass and Weight are
NOT the same!
–Weight is the FORCE
exerted by gravity on an
object.
Volume
• Amount of space
occupied by a solid,
liquid or gas.
Volume Measurement
• Graduated cylinder
• Syringe
• Buret
• Pipet
• Volumetric Flask
Metric System
MEASURING MATTER
The Metric System
The metric system was
developed in 19th century
France. The United
States is one of the few
countries not using the
metric system.
MEASURING MATTER
The Metric System
Three basic units for
measuring matter:
gram (mass)
liter (volume)
meter (distance)
MEASURING MATTER
The Metric System
The units are
expressed in
multiples of 10.
Metric System Prefixes
106
103
100
10-1
10-2
10-3
10-6
M
k
base unit
d
c
m
µ
The Metric System
1 Mg = 106 g
1 kL = 103 L
base unit
1 dm = 10-1 m
1 cg = 10-2 g
1 mL = 10-3 L
1 µm = 10-6 m
The Metric System
1 Mg = 106 g
1 kL = 103 L
base unit
1 m = 101 dm
1 g = 102 cg
1 L = 103 mL
1 m = 106 µ m