CFA - Measurement

Science Measurements

Review

Measuring Length in Centimeters

• ​Longer lines represent centimeters

• ​Smaller lines represent millimeters

• ​1 cm = 10 mm

Multiple Choice

What is the length of the red line in centimeters

• 12.10 Centimeters

• 12.70 Centimeters

• 12.30 Centimeters

• 12.50 Centimeters

Multiple Choice

What is the length of the red line in centimeters

• 12 Centimeters

• 12.20 Centimeters

• 12.40 Centimeters

• 12.90 Centimeters

Multiple Choice

What is the length of the red line in centimeters

• .40 Centimeters

• .60 Centimeters

• .80 Centimeters

• One Centimeter

​Determining the Graduations:

1. Determine the values of the graduations

   1. ​Here the labeled graduations are 10, 20, and 30.

   2. ​The value between the labeled graduations is 10 mL, with 10 spaces. This means each space represents 1.

​

Measuring Volume of a liquid

• Determine the measurements on the graduated cylinder

  • Is it 10 mL, 100, mL, 500 mL

• ​Place the graduated cylinder on a level surface with the measurement lines facing you

  • ​The water in a cylinder will form a curve called the meniscus

• ​Find the bottom of the curved meniscus in the water. This should be in the center of the graduated cylinder.

  • ​Your eye should be level with the top of the liquid

• ​Follow the lowest point at the surface of the water to the wall of the graduated cylinder. Read the volumetric scale at this point.

​Determining the Volume

1. Reading the meniscus

   1. ​Be sure to look at eye level, to avoid parallax

​

​Eye Level - 75 mL

Looking from Above - 76 mL

Looking from Below - 74 mL

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Volume With Water Displacement

1. Determine the volume of the water WITHOUT the object

2. ​Determine the volume of the water WITH the object

3. ​Subtract both values

4. ​The final answer will represent the volume of the rock

​Without Rock: 18 mL

​

​With Rock: 42 mL

​

​Volume of Rock : 24 mL

​(42 - 18 = 24 mL

Multiple Choice

What is the volume of water BEFORE the object was added

• 0.19 mL

• 19.0 mL

• 29.0 mL

• 0.29 mL

Multiple Choice

What is the volume of water AFTER the object was added

• 0.19 mL

• 19.0 mL

• 29.0 mL

• 0.29 mL

Multiple Choice

Find the volume of the object

Before Object: 19 mL

After Object: 29 mL

• 0.10 mL

• 21.0 mL

• 0.21 mL

• 10 mL

Multiple Choice

What is the volume of water BEFORE the object was added

• 0.64 mL

• 68.0 mL

• 64.0 mL

• 0.68 mL

Multiple Choice

What is the volume of water AFTER the object was added

• 0.64 mL

• 68.0 mL

• 64.0 mL

• 0.68 mL

Multiple Choice

Find the volume of the object

Before Object: 64 mL

After Object: 68 mL

• 0.59 mL

• 59.0 mL

• 4.0 mL

• 0.4 mL

Measuring Temperature

1. Determine the values on the thermometer

2. ​The red line on a thermometer is the line that indicates what the thermometer is set to.

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​Example: Here the red line is between the 60 and 70 marks. In between those marks are 9 lines. This means the temperature of the liquid here is 68.

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Measuring mass with triple beam balance scale

• ​The maximum weight a triple beam balance can measure is 600 grams.

  • ​The first beam can measure up to 10 grams.

  • ​The second beam can measure up to 500 grams, read in 100 g increments.

  • ​The third beam can measure up to 100 grams, read in 10 g increment

Measuring mass with triple beam balance scale

• ​Before you weigh something, ‘zero‘ the balance.

  • ​Do this by sliding back all the weight poises (that slide along the beams) so that the pointer is right at the zero line.

  • ​You might need to turn the zero adjustment knob a little bit to get it right at the line

  • ​Move the riders one by one (Hundreds, Tens, then one) Until the pointer lines back up with zero

Measuring mass with triple beam balance scale

• ​When measuring the mass add up all of the weights

  • ​Weight 1 : Hundreds

  • ​Weight 2: Tens

  • ​Weight 3: Ones

​

​

​Example:

​Weight 1 (Hundreds): 0

​Weight 2 (Tens): 80

​Weight 3 (Ones): 3.1

​Total weight: 83.1 g

Multiple Choice

What is the weight in the hundreds place

• 400 g

• 1.1 g

• 20 g

• 421.1 g

Multiple Choice

What is the weight in the tens place

• 400 g

• 1.1 g

• 20 g

• 421.1 g

Multiple Choice

What is the weight in the ones place

• 400 g

• 1.1 g

• 20 g

• 421.1 g

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Multiple Choice

What is the weight in the ones place

• 300 g

• 2.7 g

• 20 g

• 322.7 g

Multiple Choice

What is the weight in the hundreds place

• 300 g

• 2.7 g

• 20 g

• 322.7 g

Multiple Choice

What is the weight in the tens place

• 300 g

• 2.7 g

• 20 g

• 322.7 g

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