2 Bell Work 8/17/09Please answer the following questions in the Bell Work section of your science journalWhat instrument is used to measure length?Why do you think it is important to know how to measure length?
3 Metric System Referred to as the international system of units or SI Based on the number 10Measuring system used by all scientistsUsed to measure length, volume, mass, weight, density, and temperature
4 Length Used to measure from one point to another Instrument used to measure length is the metric rulerBasic unit of length is the meterkilometer- kmhectometer- hmdecameter- dammeter-mdecimeter- dmcentimeter- cmmillimeter – mmIn space, distance is measured in light yearsA light year is the distance light travels in a year
5 Bell Work 8/18/09 What is the metric system used to measure? What is the metric system referred to as?What is the basic unit for length?In space, what is distance measured in?
6 Homework 8/18/09Practice measuring the following items at your house. Remember to use centimeters as your unit.The width of your front doorThe height of a glass or cupOne item of your choiceFor each write down the item and the measurement for the item
7 Bell Work 8/19/09Using a ruler and centimeters (cm) measure the length of the lines on the piece of paper at your table. Please share with your partner and don’t write on the paper.Example: 6.3 cmLength of line 1:Length of line 2:Length of line 3:Length of line 4:
8 Volume Volume is the amount of space an object takes up Volume can be measured for liquids and solids.LiquidsBasic unit of liquid volume is the liter (L)kiloliter – kLhectoliter – hLdekaliter – daLliter – Ldeciliter – dLcentiliter – cLmillimeter – mLThe instrument used to measure liquid volume is the graduated cylinderMeniscus – Measure to this line.
9 Volume (cont.) Solids Basic unit of solid volume is cubic meters (m^3) cubic kilometer- km^3cubic hectometer- hm^3cubic decameter- dam^3cubic meter-m^3cubic decimeter- dm^3cubic centimeter- cm^3cubic millimeter – mm^3
10 Volume (cont.) To calculate the volume of a solid length x width x heightl x w x hInstrument used to measure solid volume is the metric rulerSolid Volume can also be measured by water displacement using a graduated cylinderRecord the volume of water in the cylinderPlace the object in the cylinder and record the new volumeMeasurement 2 – measurement 1 = volume of the object
11 Bell Work 8/20/09 What is volume? What is the basic unit for liquid volume?What is the basic unit for solid volume?How do you calculate the volume of a solid?
12 Bell Work 8/20/091. What is the volume of a solid with these measurements?Length 3 cm width 2 cm height 4 cm2. How do you find the volume of an irregular solid?
13 Mass Mass is the amount of matter in an object. Basic unit of mass is a gram (g)Large objects are measured in kilograms (kg)Small objects are measured in grams (g) or milligrams (mg)kilogram – kghectogram – hgdekagram – daggram – gdecigram – dgcentigram – cgmilligram – mgMost often used are the kg, g, and the mgInstrument used to measure mass is the triple beam balance
14 Density Shows a relationship between mass and volume To calculate density we divide mass by volumed=m/vUnits for density depend on size of objectLarge objects = kg/LSmall objects = g/mL
15 Bell Work 8/24/09 What is mass? What instrument is used to find mass? What is density?What is the formula used for density?
16 Bell Work 8/25/09 What units are most often used for mass? What units are used for density?
17 Temperature Measured in degrees Celsius Freezing = 0 degrees Celsius Boiling = 100 degrees Celsius
18 Bell Work 8/26/09 What instrument is used to measure temperature? What is the freezing point in degrees Celsius?What is the boiling point in degrees Celsius?
19 Bell Work 8/27/09 How many centimeters are in 1 meter? How many milliliters are in 1 liter?How many centigrams are in 1 gram?
20 WeightWeight is the measure of attraction between objects due to gravity.Basic unit of weight is the Newton (N)
21 Tools for Measuring A metric ruler is used to find length A graduated cylinder is used to fine the volume of a liquid or an irregular solidA metric ruler is used to find the volume of a rectangular objectA triple beam balance is used to find the mass of an object
22 Bell Work 8/28/09 1000 g = ______ kg 200 mL = ______ L 1 m = ______ Dkm77 g = ______ mg
23 Bell Work 8/28/09 25 kg = ______ mg 345 cL = ______ HL 980 m = ______ mm23700 g = ______ kg
24 Bell Work 9/1/09 98 Hg = ______ mg 222 KL = ______ L 2706 mm = ______ Dkm5 g = ______ kg
25 Bell Work 09/09/09 What is the base unit for the following? Length VolumeMass