Exploring Size: Ball Sorter

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In this activity, learners use sieves with different-sized holes to sort balls by size. They learn that researchers are developing new technologies that can sort nano-sized things, including filters with nano-sized holes. Use this activity to talk about different techniques for filtering water and the need for clean drinking water in many parts of the world.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
5 to 10 minutes

Estimated Materials Cost:
Over $20 per group of students

Age Range:
Ages 4 - adult

Resource Types:
Activity, Demonstration, Simulation

English, Spanish


  • Engineering and Technology
    • Engineering
      • Nanotechnology
    • Technology
      • Medical Technology
      • Agriculture and Biotechnology
  • Physical Sciences
    • Motion and Forces
      • Gravity


To use this activity, learners need to:

  • see
  • touch

Learning styles supported:

  • Uses STEM to solve real-world problems
  • Involves hands-on or lab activities