How to use a Triple Beam Balance.1. Move weights until the

balance is located on the ‘0’ mark.

2. Place object(s) on scale.

3. When scale is balanced, add up the 3 amounts for a TOTAL mass of the object.

What would be the mass of the object measured in the picture?

_______ + ______ + _______ = ________ g

70 g

3.3 g

300 g

300 70 3.3

373.3

Triple Beam Balance LABMaterials:Triple beam

balanceBeakerGraduated cylinderSafety glasses.Container with

waterPaper towelsMarbleContainer of baking

sodascoopalablocks

1. Mass the block for practice and record its mass.

2. Mass the beaker and then the marble in the beaker (OBJECT # 1) to determine the mass of the marble.

3. Measure 10 mL of water (OBJECT # 2) into graduated cylinder. Pour water into beaker and record its mass. Use beaker mass from step 2.

4. Pour water back into original container and dry out beaker.

5. Pour baking soda (OBJECT #3) into dry beaker and determine its mass. Use mass of beaker from step 2.

Triple Beam Balance LABMaterials:Triple beam

balanceBeakerGraduated cylinderSafety glasses.Container with

waterPaper towelsMarbleContainer of baking

sodascoopalablocks

1. Mass the block for practice and record its mass.

2. Mass the beaker and then the marble in the beaker (OBJECT # 2) to determine the mass of the marble.

3. Measure 10 mL of water (OBJECT # 3) into graduated cylinder. Pour water into beaker and record its mass. Use beaker mass from step 2.

4. Pour water back into original container and dry out beaker.

5. Pour baking soda (OBJECT #4) into dry beaker and determine its mass. Use mass of beaker from step 2.

Clean up

1. Pour baking soda back into original container.

2. Paper towel in garbage.3. Return items to basket.4. Leave safety glasses and

your paper on desk where you got them.

Volume: the amount of space an object takes up

Things we might measure the Volume of:Solids Liquids Gases

The basic units for volume are: LITER (L) or CUBIC METER (m3)*

*In this class we will use milliliters (mL) or cubic centimeters (cm3)

Tools: ruler, meter stick, calipers, graduated cylinder, beaker

Measuring Volume

1. Regular shaped object:• use a formula

2 cm

10 cm

5 cm

Measuring Volume 2. Volume of a liquid: • Use a graduated cylinder• Meniscus: the curved line formed at the surface

of the liquid

Measuring Volume (cont.)

3. Irregular shaped object • use liquid displacement

1. 1st reading: Read and record the volume of the liquid at the meniscus. (R1)

How to find the volume of an irregular object using liquid displacement.

R1 (liquid only) = 65 mL

mL

2. Add the object.3. 2nd reading: Read and record the volume of the

liquid at the meniscus. (R2)

How to find the volume of an irregular object using liquid displacement.

R2 (liquid + object) = 69 mL

mL

4. Subtract the 1st reading from the 2nd reading to get the VOLUME of the object. (V = R2 – R1)

69 mL – 65 mL = 4 mLVolume of object = 4 mL

How to find the volume of an irregular object using liquid displacement.

mL mL

mL mL

Volume ProblemsFind the volume of:

1. a book whose length is 3 cm, its width is 5 cm and its height is 2 cm.

2. a box that is 10 cm by 2.5 cm by 3 cm.

3. the teeny tiny T–rex .

THE END 2017 Inquiry PowerPoint