Activity

Heat sensitive sheets

Summary
Use liquid crystal heat sensitive sheets outdoors on a sunny day.
Science content
Physics: Heat (3)
Lessons activity is in
Materials
  • liquid crystal heat-sensitive sheets (I get Edmund Optics 25-30 range and cut into 9 smaller squares, before laminating. Note: expensive)
  • sun
  • walls, playground equipment, other outdoor objects, some that get warm in the sun
  • tub of water
Procedure

Distribute sheets to students.
Allow them to discover that the sun changes the colour of the sheets.
Give them the colour scale (for my sheets, coolest is black, then getting warmer is red, orange, yellow, blue, then black again, so black can either be coolest or warmest).
Allow students to explore the environment with their sheet.
Ideas to try in the photos, if they need suggestions.

Discuss what kinds of heat transfer heated the sheets up:
Radiation from the sun.
Conduction when the sheet is pressed against a surface or with water.

Grades taught
Gr 3