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.