there are two focusing knobs on a microscope: what are they? define when to use each. how do you...
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Warm up 9/16There are two focusing knobs on a
microscope: What are they? Define when to use each.
How do you find the total magnification of the microscope.
What does the diaphragm do on a Microscope?
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How Do Scientists Measure?
The Metric SystemAKA SI or Système International
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Way Back When . . .
When people first started to measure things, the systems were different in different parts of the world.
Many systems were based on parts of the body.
Foot Inch
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How to Measure?
Many countries tried to make a system of measurement.
Both France and England came up with systems that are used today.
England started the English Standard System and France started the Metric
System.
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Comparing the two Systems . . . English Standard
System Based on:
2, 3, 4, 8, 16 Generally uses
fractions
2 pints in a quart 3 feet in a yard
4 quarts in a gallon12 inches in a foot
16 ounces in a pound
Metric SystemBased on: 10
(like U.S. money)
Generally uses decimals
100 centimeters in a meter 1000 grams in a kilogram1000 milliliters in a liter
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Why the Metric System?
Over 95% of the world uses the Metric System.
The metric or SI (scientific international) system is aids scientists in sharing measurements No need to convert another person’s data if we
all work in SI Ex/ NASA still works in imperial units and has
had difficulty when needing to work with other groups that use metric▪ In 1999 the Mars Climate Orbiter was lost because
the altitude control system used imperial units and the navigation software used metric.
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Metric
Units can be scaled by factors of 10 depending on what you are measuring So it can be used for small stuff as well as
large king Henry Died by drinking chocolate milk
kilo- Hecto- Deca- Base- deci- centi- milli-
1000 100 10 1 1/10th 1/100th 1/1000th
You are only responsible for the units in black
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Mass
Measurement: Mass Unit used: Gram (g) Tool Used: Balance
A paper clip has the mass of about 1 gram.
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Length/Distance Measurement: length/distance Unit used: Meter (m) Tool Used: Ruler/meter stick
A centimeter is about the width of a small fingernail
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Volume
A liter is just a little bit
more than 1 quart (or 2 pints)
Measurement: Volume
Unit used: Liter (l) Tool Used:
graduated cylinder
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Temperature
Measurement: Temperature Unit used: Celsius (C) Tool Used: Thermometer 0o Celsius= freezing 100o Celsius= boiling
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Today . . .
As of the late 1970s, only the United States, Liberia (Africa) and Myanmar (formerly Burma in Asia) use the English Standard System.
Every other country, and scientists worldwide, use the metric system.
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Practice Problems
Convert 15 grams (g) to kilograms (kg)
15 g X 1 kg = kg 1000 g
.015
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Classwork Homework
Metric System Pre-Lab Due Tomorrow (Thursday)
Study Guide Due Tuesday Sept 22 Exam Thursday Sept 24
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Warm up 9/7
What are the metric prefixes which we remember withking Henry Died by drinking Chocolate Milk
What percentage of the world’s countries use metric?
When is the first Exam? When is the Study Guide Due?