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Learners observe and compare the sizes of three toy “growing” crocodiles made from water-absorbent polymers. One is it its original state, dry, hard, and about 10cm long. One is immersed in salt water in a 2-liter bottle, a bit softer, and about 20cm long. The third is in pure water in a 2-liter bottle and completely fills the bottle. This is a long-term activity. Learners can observe and record the growth of the crocodile over a period of days; it can last in this state indefinitely.
- 5 to 10 minutes
- 1 to 7 days
- $5 - $10 per group of students
- Ages 6 - adult
- Activity, Experiment/Lab Activity
- English
Quick Guide
Materials List (per group of students)
- Two clear 2-liter soft drink bottles with caps
- Three crocodile grow creatures (available at many toy stores, the OMSI Science Store, or Flinn Scientific, 1-800-452-1261)
- water
- salt
Subjects
-
Physical Sciences
-
Chemistry
- Solutions
-
Chemistry
Informal Categories
- Toys
Audience
To use this activity, learners need to:
- see
Learning styles supported:
- Involves hands-on or lab activities
Other
This resource is part of:
Access Rights:
- Free access
By:
Rights:
- All rights reserved, Oregon Museum of Science and Industry, 1997
Funding Source:
- National Science Foundation