Warm up 9/13 There 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?

Exam Friday Study guide: Due Friday Characteristics of Life Microscopes Scientific Method/ Experimental Design Metric Conversion

Exam Friday Griffin Virtual Lab With Mr. Lee Tonight at 6 pm there is a link on Mr. Lee’s website. To sign up for reminders for future GVL text @biogvl to 81010 or add to Remind app

How Do Scientists Measure? The Metric System AKA SI or Système International How Do Scientists Measure?

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

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.

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 gallon 12 inches in a foot 16 ounces in a pound Metric System Based on: 10 (like U.S. money) Generally uses decimals 100 centimeters in a meter 1000 grams in a kilogram 1000 milliliters in a liter

Why the Metric System? Over 95% of the world uses the Metric System. The metric or SI (system 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.

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

How many jumps does it take? Ladder Method 1 2 3 KILO 1000 Units HECTO 100 Units DECA 10 Units DECI 0.1 Unit Meters Liters Grams CENTI 0.01 Unit MILLI 0.001 Unit How do you use the “ladder” method? 1st – Determine your starting point. 2nd – Count the “jumps” to your ending point. 3rd – Move the decimal the same number of jumps in the same direction. 4 km = _________ m Starting Point Ending Point How many jumps does it take? 4. 1 __. 2 __. 3 __. = 4000 m

Conversion Practice Try these conversions using the ladder method. 2000 mg = _______ g 5 L = _______ mL 16 cm = _______ mm Compare using <, >, or =. 76 dm 7 m 5 g 625 mg

Mass Measurement: Mass Unit used: Gram (g) Tool Used: Balance A paper clip has a mass of about 1 gram.

Warm up 9/14 What are the metric prefixes which we remember with king 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?

A centimeter is about the width of a small fingernail Length/Distance Measurement: length/distance Unit used: Meter (m) Tool Used: Ruler/meter stick A centimeter is about the width of a small fingernail

A liter is just a little bit more than 1 quart (or 2 pints) Volume Measurement: Volume Unit used: Liter (l) Tool Used: graduated cylinder A liter is just a little bit more than 1 quart (or 2 pints)

Reading a Gradated Cylinder Measure from the bottom of the meniscus 66 ml

Temperature Measurement: Temperature Unit used: Celsius (C) Tool Used: Thermometer 0o Celsius= freezing 100o Celsius= boiling

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.

Practice Problems Convert 15 grams (g) to kilograms (kg) 15 g X 1 kg = kg 1000 g .015

Classwork Homework Metric System Pre-Lab Study Guide Due Tomorrow (Thursday) Study Guide Due Tuesday Sept 22 Exam Thursday Sept 24