Liquid Volume Measurement
Tools & Methods
Meniscus
Water is adhesive… sticks to stuff.
It “climbs” the glass.
The curve formed is the meniscus.
We Read the BOTTOM of the curve!
Note that this cylinder is NOT graduated. Could we measure with it?
Liquid Measurement Tools
Beaker: Mixing, Boiling, Storing
Liquid Measurement Tools
Erlenmyer Flask: Mixing, Storing, Boiling
Liquid Measurement Tools
Graduated Cylinder: Measuring
Liquid Measurement Tools
• Medicine Droppers• Pipets… Accurately measure small volumes.
Steps
– Determine the scale.– Set sample on flat surface.– Get down to eye-level.– Read bottom of the curve.– Estimate the last digit.– Include the proper units.
Determine Scale
What is this a picture of?
A 400 mL Beaker
What is the scale?
25 mL
Determine Scale
What is this?
A 25 mL graduated cylinder.
What is the scale?
0.2 mL
What is the volume of water in this cylinder?
20.60 mL
Determine Scale
What is this?
A 500 mL Erlenmyer Flask.
What is the scale?
100 mL
Liquid Volume Lab Practice1. Line up 6 different measuring tools.
1. They are a. b. c. d. e. f.
2. Put a random amount of water in each.
3. On your paper, write:1. Name of tool.
2. Scale
3. Amount of water in it.
4. Call Mr. Frost over to check.