A8 Measuring VolumeDo Now for 9/30/13

1. Take out A7 number 1 and staple your rubric to it.

Open your book to page A-32 and read and write up Activity A8.

2. Take out sheets 8.1a and 8.1b from your packet of tables.

HW: A7 #5 is due tomorrow

A8 Measuring Volume

Volume can be measured in two (2) ways:1. Multiplying the length X width X heightL x W x HUsed for “regularly” shaped objects. Does NOT work for objects with an irregular shape.

2. Water displacementUsed for “irregularly” shaped objects.

Volume

Volume – The amount of space an object takes up.

Need a common system of measurement. The metric system is used by scientists all over the world to make measurements.

Use the table on page A-33 “Units of Measurement” to compare metric units to English units.

English vs. Metric Units

Which is larger?

A. 1 liter or 1 gallon

B. 1 liter or 1 quart

C. 1 milliliter or 1 fluid ounce

1 gallon = 3.79 liters

It would take approximately 3 ¾ 1-liter bottles to equal a gallon.

1 fl oz = 29.573 ml

1 12-oz can of soda would equal

approximately 355 ml.

1 quart = 0.946 liters

10 cm

9 cm

8 cm

We can measure the volume of regular object using the formula length x width x height

_____ X _____ X _____ = _____

Measuring Solid Volume

Measuring Volume

Top Image: http://www.tea.state.tx.us/student.assessment/resources/online/2006/grade8/science/images/20graphicaa.gifBottom 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 Solid Volume

Click here for an online activity about volume. Choose Lessons Volume & Displacement

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We can measure the volume of regular object using the formula length x width x height.

_____ X _____ X _____ = _____

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We can measure the volume of irregular object using water displacement.

Amount of H2O with object = ______

Amount of H2O without object = ______

Difference = Volume = ______

A8 Measuring Volume

• Student sheet 8.1a reviews different methods to calculate volume:– Regular objects

• Cubes – V= L X W X H• Cylinders – V= pi X r2 X H• Pi = 3.14159

– Irregular objects• V= V final – V initial

• Use this sheet to determine which method works best for each object.

• Record all your information on Student sheet 8.1b

A8 Measuring VolumeLab Safety – Since we don’t know what the objects are made of, how should we protect ourselves?

Skip Procedure step 1Follow the procedure beginning on page A-34. REMEMBER STEP 3!!!

Choose the method of measuring volume that you think will be best for each object.

You should measure all the objects at your station.

Begin the analysis questions

Exit Ticket

• Take out a 3x5 card and put your name, date, and period in the upper right hand corner.

• Answer the following question:• What method would you use to

measure the volume of a small stone? HINT: The stone has an odd shape.

• Turn your answer in at the end of the period.

Do Now for 10/1/13• Take out A7 #5 and get it ready to hand

in.• HW: Complete lab report for A8.• Meet the Elements

A8 Measuring Volume• Today’s Target: I will be able to understand

why my volume calculations may be SLIGHTLY different than someone else’s.

• Collect A7 #5• Yesterday’s Exit Ticket Question• Discuss data• Discuss Analysis• Key Points • Vocabulary

Yesterday’s Exit Ticket• What method would you use to

measure the volume of a small stone? HINT: The stone has an odd shape.

A8 Measuring Volume• Go over data• Analysis

SAMPLE DATA FOR ACTIVITY A8

Use the data below to calculate the volume for each object. Record your information on sheet 8.1b in your packet of data tables.

Object Method Used MeasurementsLight gray bar Measurement 1.2 cm x 1.2 cm x

5.0 cm

Dark gray bar Measurement 1.3 cm x 1.3 cm x 5.0 cm

Light gray cube Measurement 2.5 cm x 2.5 cm x 2.5 cm

Dark gray cube Measurement 2.5 cm x 2.5 cm x 2.5 cm

Light gray cylinder

Displacement Vi = 30 mL Vf = 36 mL

Dark gray cylinder Displacement Vi= 30 mLVf=37 mL

A8 Measuring Volume• Key Points for A8• Measurements and mathematics are

important in all aspects of scientific inquiry.– Ex.

• Scientists use common units of measurement to collect data. This system is known as the metric system.– Ex.

A8 Measuring Volume Vocabulary

• 1. Cubic centimeter (cc, cm3): Metric measurement of volume. A cubic centimeter corresponds to a cube measuring 1 cm x 1 cm x 1 cm. A cubic centimeter of water is one mL.

• 2. Liter (L) Metric unit of volume. One liter is approximately 1.1 quarts.

• 3. Metric system (SI): The measuring system used by scientists and most countries other than the United States and United Kingdom.

• 4. Milliliter (mL): Metric (SI) unit of volume. One mL is 1/1000 of a liter and is equal to one cubic centimeter.

• 5. Qualitative: Description, observation or analysis of a substance based on its qualities.

• 6. Quantitative: Description, observation or analysis of a substance based on measurements.

• 7. Volume: The amount of space that an object or substance occupies.

A8 Measuring Volume• What to complete for A8

– Title– Challenge– Safety– Prediction from step 3– Data– Step 10 results– Analysis – Complete sentences where needed.– Key Points with examples– Vocabulary words

Exit Ticket• Take out a 3x5 card and place your

name, date, and period in the upper right hand corner.

• Answer the following question:– How would you measure the volume of

this classroom?• Due at the end of the period.

Do Now for 10/2/13• HW: Benchmark on Friday

A9 Measuring mass, calculating density

• Today’s Target: I will be able to tell the difference between mass and weight.

• Check A8 report• Introduce A9• Read and write up A9 (Including BOTH

data tables)

A9 Measuring mass, calculating density

• Check A8– Title, Challenge, Safety – 5 points– Procedure step 3 – 5 points– Data Table with data – 10 points– Step 10 results – 5 points– All 6 Analysis questions answered in complete

sentences – 1 point each = 6 points– Key Points with examples – 2 points each = 4

Points– Vocabulary – 1 point each = 7 points– Total = 42 points

A9 Measuring Mass, Calculating Density

• Read and write up A9

A9 Measuring mass, calculating density

Mass – The amount of matter in an object. Different than weight – Pull of gravity on an

object. Weight can change but mass cannot.

Farther away from the earth the lower your weight, but your mass stays the same.

Go to the moon or a smaller planet = less gravity = less weight, but mass stays the same.

Go to a larger planet (Jupiter) = more gravity = more weight, but mass stays the same.

A9 Measuring mass, calculating density

• Density – The amount of mass (stuff) in a given unit of volume. The amount of stuff packed into a given unit of space.

• We’re going to measure the densities of our various objects.

• Read A9 beginning on page A-36. – Write up A9 including BOTH data tables

A9 Measuring Mass , Calculating Density

• Introduction to Density• Use of a Triple Beam Balance

• EXIT TICKET: Show us both data tables.