1 Geyser HOLLY STURROCK WAIMEA COLLEGE The Problem

1. Geyser HOLLY STURROCK WAIMEA COLLEGE

The Problem Support a long, vertical tube containing water. Heat the tube directly from the bottom and you will observe that the water erupts. Arrange for the water to drain back into the tube to allow repeated eruptions. Investigate the parameters that affect the time dependence of the process. 2

Overview §Experimental Set-Up §Eruption Explanation §Experimental Results & Interpretations § Tube Length § Length of Tube in Flask §Conclusion §References 3

Catch Basin System Set-Up Bungs Glass Tube Control Variables § Tube diameter § § Internal 4 mm Total 6 mm § Height Above Heat § Gauze Mat 120 mm § Water in Catch Basin § Conical Flask Tripod To Ring Bunsen Burner Retort Stand 4

Eruption Definition § Water Level Below Mark § Water Level Below Tube § Water Level Hits Mark 5

Steam is generated, increasing the pressure Water is pushed into the catch basin Pressure in the flask is decreased Boiling temperature is decreased Decreasing pressure below atmospheric Water is pushed down tube from the catch basin Hydrostatic pressure is decreases Water boils more violently Steam condenses the tube, this flows down into the flask Amount if boiling is increased Increases the pressure & decreases the temperature in the flask Boiling slows rapidly Temperature in the flask is decreased Period of quiet while system regains heat energy Eruption begins again 6

Hydrostatic Pressure – Pressure caused by water above 7

Steam is generated, increasing the pressure Water is pushed into the catch basin Hydrostatic pressure is decreased Water boils more violently 8