Presentation on theme: "Volume: Graduated Cylinder"— Presentation transcript:
1Volume: Graduated Cylinder What is volume?Volume – (def.) the amount of space an object takes upHow could you find thevolume of a glass ofwater? A penny?Glass of water – measure out the volume using a graduated cylinderPenny – use the “Water Displacement Method”
2Tool: The Graduated Cylinder Graduated cylinder (def) – A cylindrical tool used to measure the volume of liquids and irregular solidsFound in various sizes to hold different volumes of liquidMeasured in milliliters (mL)
3What is a liter? mL kL L Metric Benchmark: cLmLLMetric Benchmark:The base unit used to measure volume in the metric system is the liter (L)The volume of 1 liter was determined by calculating the size of one cubic decimeter10 cm x 10 cm x 10 cm = 1000 cm³ = 1L
4Standard vs. Metric Which is larger? 1 fl oz = 29.573 mL A. 1 liter or 1 gallonB. 1 liter or 1 quartC. 1 milliliter or 1 fluid ounce1 fl oz = mLOne 12-oz can of soda would equal approximately 355 mL1 liter = 1.06 quartsIt would take approximately 3 ¾ 1-liter bottles to equal a gallon.1 gallon = 3.79 liters
6To find the volume of a liquid… Pour the liquid into a graduated cylinder(Be sure to use a measuring tool that is close in size to the object you are measuring! )Look at the water at eye levelIf you look closely you will see that the surface of the water is not straight across, but curves slightlyThis curve is called a “meniscus”Read the line where the meniscus touches as the volume of liquid being measured
7What is a meniscus?The meniscus is (def.) the concave surface of a liquid used to determine volume in a graduated cylinderTo read the meniscus, look at the lowest point of the curve at eye level.*The meniscus forms when the molecules of the liquid become attracted to side of the container that holds them
8Step 1: Find the two labels surrounding the water level. *The meniscus is between 50 mL and 60 mLStep 2: Use the labels to find the nearest graduated increment. Count up from the smaller line.*The meniscus is between 52 mL and 53 mLStep 3: Estimate the water level as accurately as possible based on the placement of the meniscus on the line.*The meniscus is about ¾ of the way between 52 mL and 53 mL, so the final reading would be mL
9Practice finding the volume for the next few graduated cylinders: In between what two markings does the meniscus fall between?What exact marking does the meniscus touch?
10Practice Problems Between which two markings does the level fall? (Hint: Notice the interval markings)What exact marking does the meniscus touch?
11Measuring Irregular Solid Objects Technique 1: To find the volume of an irregularly shaped object, you must use a method called the “Water Displacement Method”How do I find the volume of this model triceratops??
12The Water Displacement Method Step 1 – Measure the volume of water in your graduated cylinder. Record your information.Step 2 – Place the solid object into the cylinder.Step 3 – Measure the new water level.Step 4 – Subtract the old water level from the new water level. You now have the volume of the solid object.New Volume – Old Volume = Difference (Volume of object being measured)
13Measuring Solid Objects Technique 2: To find the volume of a Rectangular Prism…Multiply the length (l) x width (w) x height (h)What is the volume of this rectangular prism?l = 5 cm, w = 4 cm, h = 10 cm5 cm x 4 cm x 10 cm200 cm³hwl
14Measuring Solid Objects Technique 3: To find the volume of a Cylindrical Prism…Multiply ∏ r² hWhat is the volume of this cylindrical prism?∏ = 3.14r = 5 cmh = 6 cm
15Accelerated Bellwork: Find the volume shown in each of the following graduated cylinders:Write your units in mL, cL, dL and LACB