Convection - Hot Plate

Purpose

To see convection currents.
 

Equipment

Hot plate and point source of light.

 

Images

i2-43

Description

The irregular refraction patterns created by convection currents in air heated from below are easily seen when a light from a projector shines through the air onto a screen. This phenomenon is often seen when the sun shines brightly onto surfaces like cars and roads, and is responsible for the twinkling of stars.