Atmospheric Mat with Hook, Measures 10.5 x 10.5 In, durable, thick rubber mat has a simple design that demonstrates a powerful concept - Atmospheric Pressure
Convection Of Gas Apparatus, Small, Ventilation Apparatus, Smaller Sized To Fit In Any Classroom Than Standard Convection Of Gas Apparatus, Comprised Of A Metal Box 4inX6inX4in With A Sliding Front Door, Two Glass Chimneys And A Candle Holder.