Stoekle's apparatus: Heated tube with mercury and glass bits.

Stoekle's apparatus: Heated tube with mercury and glass bits. The apparatus gives a demonstration of the thermal agitations of gaseous molecules. It is a Pyrex glass tube containing a small amount of mercury. On the surface of the mercury there is a quantity of crushed glass. The tube is evacuated and sealed. On heating with the bunsen burner, the mercury boils at a low temperature and the mercury vapor given off at high velocity carries with it particles of the glass which move about violently in the glass tube in a manner similar to the motions of gas molecules. KINETIC THEORY AND GAS MODELS.