User login


Cool It!


Source Institutions

    Oregon Museum of Science and Industry

Add to listGo to activity
Cool It!

Learners make a refrigerator that works without electricity. The pot-in-pot refrigerator works by evaporation: a layer of sand is placed between two terra cotta pots and thoroughly soaked with water. The contents of the inner pot are covered with a wet cloth. As the water evaporates, it cools the contents. If more water is added, the cooling can be maintained for some time. The lesson plan includes handouts, background information, and suggested extension activities.

Quick Guide


Preparation Time:
30 to 45 minutes

Learning Time:
45 to 60 minutes

Estimated Materials Cost:
$1 - $5 per group of students

Age Range:
Ages 11 - 14

Resource Types:
Activity, Lesson/Lesson Plan

Language:
English

Materials List (per group of students)


  • 2 large clay pots (flower pots work well)
  • 2 clay pots small enough to fit in the larger pots with some space between them
  • Sand or fine gravel
  • 2 pieces of cloth large enough to cover the large pots (Make sure they’re both the same type. Felt, cotton, and canvas work well.)
  • 2 small containers with lids that can fit in the small pot (Baby food jars or film canisters work well.)
  • Plastic bottles (Water bottles with pop-up lids work well.)
  • Water
  • 2 small pieces of cardboard or cardstock
  • Two thermometers
  • Scissors
  • Materials to photocopy: Student Background and Student Procedure (1 per group)
  • Optional: One or two fans for the class

Subjects


  • Earth and Space Science
    • Earth Structure
      • Oceans and Water
  • Engineering and Technology
    • Technology
      • Energy and Power
  • Physical Sciences
    • Heat and Thermodynamics
      • Heat and Temperature
      • Heat Transfer
    • Energy
      • Energy and Power
    • States of Matter
      • Liquids
      • Gases
      • Changes of Phase
  • The Nature of Technology
    • The Design Process
      • Invention and Innovation

Audience


To use this activity, learners need to:

  • see
  • read
  • touch

Learning styles supported:

  • Involves teamwork and communication skills
  • Involves hands-on or lab activities

Other


Includes alignment to state and/or national standards

Access Rights:

  • Free access

By:

Rights:

  • All Rights Reserved, OMSI, ©2006

Funding Source:

  • NASA

Share


User Lists


This resource is part of these lists: