GENERAL RULES OF MEASUREMENT All measurements are METRIC! Use the - - PDF document

November 05, 2015

GENERAL RULES OF MEASUREMENT

• All measurements are METRIC!
• Use the correct piece of equipment
• All measurements are METRIC!
• Make all readings at eye level
• All measurements are METRIC!
• If your measurement falls between 2 lines, then your

best answer is .5 or .05

• All measurements are METRIC!
• ALL numbers have units!
• All measurements are METRIC!

In measuring, the Habit of Mind we use the most is "Striving for Accuracy". EQ: What's the difference between accuracy and precision? Precision refers to the equipment used. Accuracy refers to the person using the equipment. As scientists, we are as accurate as we can be with the precision of the equipment we are using.

November 05, 2015

Tools of a Scientist

Measuring Basic Unit Equipment Length/Distance Meter Ruler/Meter Stick Liquid Volume Liter Graduated Cylinder/ Beaker Mass Gram Triple-Beam Balance

Ruler Measuring Practice: Measure in cm then convert to mm and m

Cube in cm in mm in meters Length Width Height Rectangle Block in cm in mm in meters Length Width Height Box in cm in mm in meters Length Width Height

November 05, 2015

To find the volume of a regular shaped

• bject:

· Measure length, width and height (don't forget the units) · Multiply these numbers: L x W x H (don't forget to multiply the units as well) EXAMPLE: 2 cm x 3 cm x 4 cm = 24 cm3 Volume is the space an object occupies.

To find the surface area of the top of a regular shaped object:

• Measure length and width (don't forget the

units)

• Multiply these numbers: L x W (don't forget

the multiply the units as well) EXAMPLE: 2 cm x 4 cm = 8 cm2 Area is the top surface of an object.

November 05, 2015

· Unless told differently, ALL answers should be rounded to 2 decimal places (nearest 1/100) · Even whole numbers will have numbers after the decimal point. · EXAMPLE: if your answer is 27 cm3, your final answer will be 27.00 cm3 · Placing a "repeating bar" (27.66 cm3) is NOT

• rounding. What should your correct answer be?

Rounding your FINAL answer:

Step 1: Write the formula (if it hasn't been given to you in the problem). Step 2: Fill in the formula with your measurements (DON'T FORGET UNITS!) Step 3: Solve the problem (DON'T FORGET UNITS and ROUNDING!)

Showing your work:

November 05, 2015

Volume of the rectangle block: _______cm X ______ cm X _______ cm =__________ cm3 (length) (width) (height) Volume of the box: _______cm X ______ cm X _______ cm =__________ cm3 (length) (width) (height) Volume of the cube: _______cm X ______ cm X _______ cm =__________ cm3 (length) (width) (height)

Measures: Liquid Volume Basic unit: Liter Equipment: Graduated Cylinder

http://www.cstephenmurray.com/onlinequizes/chemistry/measuring/readingthemeniscus.htm

Reading a Graduated Cylinder (GC): · Determine the scale -- different GCs have different scales so BE CAREFUL. · GC must be on a level, flat surface · Read at eye level · Read at the bottom of the meniscus

November 05, 2015

http://www.cstephenmurray.com/onlinequizes/chemistry/measuring/displacementmethod.htm

What to do with a rock (or any other irregularly shaped

• bjects)?

What every good science student should know:

• 2 forms of matter cannot exist in the same place at the

same time.

• All measurements are are done in METRIC!
• In the metric system, 1mL = 1cm3 = 1 g
• mL measures liquid volume and cm3 measures solid

volume So, we use the WATER DISPLACEMENT method.

One will be pushed out of the way - in a GC the water

will be pushed up

Pan Indicator Adjustment knob Beams Sliders/Riders

2 1

Measures: MASS, which is the amount of matter in an object. Basic unit: gram Equipment: Triple Beam Balance