Talk:Pyroclastic surge
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[edit] Model
We can model a pyroclastic surge by using the white steam from an ultrasonic humidifier. The water droplets and the air are fairly warm, yet the steam flows downward to form a ground-hugging density current. Air has a density of around 1.2KG/M^3, but if the added mass due to suspended particles is significant, then even though the particles remain suspended, they drag down the air between them as they fall. --Wjbeaty 21:09, 6 August 2006 (UTC)
