Good afternoon future scientists, please work with your partner to complete the Measuring in SI worksheet. Do you know what is the fastest thing on earth?
Rules for using the microscope. 1.Carry with two hands 2.Always start with low power. 3.Bring the stage up 4.Place specimen on the slide and cover with a cover slip
This is a microscope slide. This is a cover slip.
Part 2- The Microscope Invented in the 1500s Robert Hooke was the first to see cells Anton van Leeuwenhock was the first to see living things
Total Magnification Power The power of the eyepiece lens X the power of the objective lens being used. 10x X 40x = 400x
International System (SI) of Measurement
Advantages of the Metric System Creates an international system of measurement that uses the same standards world wide Ease of recording and calculating –All units are based on units of 10 –Very precise measurements can be recorded with decimals NOT fractions.
Subdivisions can be divided again and again for more precision….1 unit.01 unit.001 unit (Again by tenths)
“Base” Units Unit of Length- Meter –Based on the distance from the N. Pole to the equator Unit of Volume- Liter –The space an object takes up (solid, liquid or gas) Unit of Mass- Gram –The amount of matter in an object
A. FROM KILO TO MILLI Important prefixes to know: BASE UNIT DECA 10x HECTA 100x KILO 1000x DECI.1 CENTI.01 MILLI.001 The base of any unit determined by what you are measuring A prefix that makes a unit 10x larger than the base This prefix changes the base into a unit 100x larger This prefix changes the base into a unit 1000x larger This prefix changes the base into a unit 1/10 as large as the base This prefix changes the base into a unit 1/100 as large as the base This prefix changes the base into a unit 1/1000 as large as the base Metric prefixes can be placed in front of all metric units!
BASE UNIT DECA HECTA KILO DECI CENTI MILLI Come up with a sentence to order the prefixes! How are we going to remember these? King Henry Died By Drinking Chocolate Milk
Metric Tools Balance – used to measure mass (grams) Graduated cylinders and beakers – used to measure volume(liters) Meter stick – used to measure length (meters)
Microscope Used to magnify objects and make small details more apparent. Compound microscopes have two lenses that magnify the object. The eye piece and the objective lens. Total magnification = eye piece X obj. lens 3 objective lenses: 4x, 10x, 40x
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#9 Eye Piece—The part you look at with your eye. Usually 10 X magnification. Click Here to Return to the Main Slide
Click Here to Return to the Main Slide #10 Arm – Used to safely transport microscope
Click Here to Return to the Main Slide #11 Stage – Slides are placed on this
Click Here to Return to the Main Slide #12 Coarse Adjustment – Used to make large changes in focus. NOTE Never use this when viewing on high power
Click Here to Return to the Main Slide #13 Fine Adjustment – Used to make small adjustments of focus on high power
Click Here to Return to the Main Slide #14 Base – Used to safely transport the microscope
Click Here to Return to the Main Slide #1 Body Tube – Reflects light up to the viewers eye
Click Here to Return to the Main Slide #2 Rotating Nose Piece – Allows for quick change of objectives
Click Here to Return to the Main Slide #3 Low Power Objective – The first lens you use. 4 X
Click Here to Return to the Main Slide #4 Medium Power Objective – The second lens you use. 10 X.
Click Here to Return to the Main Slide #5 High Power Objective – The highest magnification used. 40 X. NEVER use the course adjustment when using this lens.
Click Here to Return to the Main Slide #6 Stage Clips – Use to keep the slide in place.
Click Here to Return to the Main Slide #7 Diaphragm – Use to vary the amount of light passing through the slide. Usually it is better if the amount of light is low.
Click Here to Return to the Main Slide #8 Light Source – Sends light up through the diaphragm and through the slide for viewing