Presentation on theme: "* SI means System International PrefixSymbolFactor NumberFactor Word Kilo-k1000Thousand Hecto-h100Hundred Deca-da or dk10Ten Unitm, l, or g1One."— Presentation transcript:
* SI means System International
PrefixSymbolFactor NumberFactor Word Kilo-k1000Thousand Hecto-h100Hundred Deca-da or dk10Ten Unitm, l, or g1One Deci-d.1Tenth Centi-c.01Hundredth Milli-m.001thousandth
Thousand Hundred Ten One Tenth Hundredth Thousandth km kg kL hm hg hL dkm dkg dkL mgLmgL dm dg dL cm cg cL mm mg mL
STATING A MEASUREMENT I N EVERY MEASUREMENT THERE IS A N UMBER FOLLOWED BY A U NIT FROM A MEASURING DEVICE T HE NUMBER SHOULD ALSO BE AS PRECISE AS THE MEASUREMENT !
SOME TOOLS FOR MEASUREMENT Which tool(s) would you use to measure: A. temperature B. volume C. time D. weight
You can measure the length of ANYTHING! When we measure length we measure how long something is.
Standard units Millimeters (mm) Centimeters (cm) Meters (m) Kilometers (km)
MASS VS. WEIGHT M ASS : A MOUNT OF M ATTER ( GRAMS, MEASURED WITH A BALANCE) M ASS : A MOUNT OF M ATTER ( GRAMS, MEASURED WITH A BALANCE) W EIGHT : F ORCE EXERTED BY THE MASS, ONLY PRESENT WITH GRAVITY ( POUNDS, MEASURED WITH A SCALE) W EIGHT : F ORCE EXERTED BY THE MASS, ONLY PRESENT WITH GRAVITY ( POUNDS, MEASURED WITH A SCALE) Can you hear me now?
The formula for finding the volume of a rectangle is …. L x W x H = Volume This means we take the length times the width, then multiply that by the height.
Measuring Volume Top Image: http://www.tea.state.tx.us/student.assessment/resources/online/2006/grade8/science/images/20graphicaa.gif Bottom Image: http://morrisonlabs.com/meniscus.htm We will be using graduated cylinders to find the volume of liquids and other objects. Read the measurement based on the bottom of the meniscus or curve. When using a real cylinder, make sure you are eye-level with the level of the water. What is the volume of water in the cylinder? _____mL What causes the meniscus? A concave meniscus occurs when the molecules of the liquid attract those of the container. The glass attracts the water on the sides.
Measuring Liquid Volume Images created at http://www.standards.dfes.gov.uk/primaryframework/downloads/SWF/measuring_cylinder.swf What is the volume of water in each cylinder? Pay attention to the scales for each cylinder.
VOLUME DISPLACEMENT A SOLID DISPLACES A MATCHING VOLUME OF WATER WHEN THE SOLID IS PLACED IN WATER. WHEN THE SOLID IS PLACED IN WATER.
Measuring Solid Volume Click here for an online activity about volumeClick here for an online activity about volume. Choose Lessons Volume & Displacement 10 cm 9 cm 8 cm We can measure the volume of regular object using the formula length x width x height. _____ X _____ X _____ = _____ http://resources.edb.gov.hk/~s1sci/R_S1Science/sp/e n/syllabus/unit14/new/testingmain1.htm We can measure the volume of irregular object using water displacement. Amount of H 2 O with object = ______ About of H 2 O without object = ______ Difference = Volume = ______
Density is defined as mass per unit volume. It is a measure of how tightly packed and how heavy the molecules are in an object. Density is the amount of matter within a certain volume. Density
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2- Find the volume of the object 1- Find the mass of the object ALWAYS REMEMBER UNITS!
DENSITY - AN IMPORTANT AND USEFUL PHYSICAL PROPERTY Mercury 13.6 g/cm 3 21.5 g/cm 3 Aluminum 2.7 g/cm 3 Platinum
DENSITYDENSITY D ENSITY IS AN INTENSIVE PROPERTY OF MATTER. D ENSITY IS AN INTENSIVE PROPERTY OF MATTER. DOES NOT DEPEND ON QUANTITY OF MATTER. DOES NOT DEPEND ON QUANTITY OF MATTER. TEMPERATURE TEMPERATURE C ONTRAST WITH EXTENSIVE C ONTRAST WITH EXTENSIVE DEPENDS ON QUANTITY OF MATTER. DEPENDS ON QUANTITY OF MATTER. MASS AND VOLUME. MASS AND VOLUME. Styrofoam Brick
P ROBLEM A PIECE OF COPPER HAS A MASS OF 57.54 G. I T IS 9.36 CM LONG, 7.23 CM WIDE, AND 0.95 MM THICK. C ALCULATE DENSITY ( G / CM 3 ).
If you have 2 or more substances, the MORE dense substance will be on bottom The LESS dense substance will be on top
Temperature is measured on two scales: Celsius and Fahrenheit. 98.6 37C F
The lower case “C” is the symbol for the Celsius scale. C We will use Celsius