Each group needs:

• clear, narrow-necked plastic bottle (~355 ml [12 oz] water bottles work well); ask students to bring rinsed plastic bottles from home
• clear, plastic drinking straw
• Make Your Own Temperature Scale Worksheet, one per student

For the entire class to share:

• a few thermometers
• measuring cups
• 207 ml (7 oz) rubbing alcohol
• 207 ml (7 oz) water
• large glass jar (to mix the alcohol and water)
• stirring rod
• food coloring
• rulers
• fine-point permanent markers
• modeling clay