Available online
Description
Some of the unusual properties of the ice/water system are examined.
Some of the unusual properties of the ice/water system are examined.
| Module code and title: | ST285, "Solids, liquids and gases" |
|---|---|
| Item code: | ST285; 16 |
| First transmission date: | 29-09-1973 |
| Published: | 1973 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:24:30 |
| + Show more... | |
| Producer: | Andrew Millington |
| Contributors: | Paul Clark; Barrie Jones; Robert Vivian |
| Publisher: | BBC Open University |
| Keyword(s): | Atomic models; Clausius-Clapeyron equation; Density variation; Glacier motion; Ice/water system; Pressure melting; PT diagram; PVT surface |
| Footage description: | Film shots of nitrogen freezing in a test tube and sinking to the bottom. Shots of icebergs, frozen water pipes, frozen cars, glaciers etc., as examples of the properties of the ice/water system. Barrie Jones points out some of the special properties of water. He uses diagrams of cross sections of PVT surfaces at first order phase changes for a normal substance and for water. Film shots of ice forming at the top of a tank of water in the laboratory. The temperature profile showing the density variation of water is superimposed and the thermocline pointed out. Paul Clark sets up the relationship between increase in volume at freezing point and pressure melting in terms of the Clausius - Clapeyron equation. He uses a PVT surface as an aid. Several film shots of people engaged in winter sports illustrate the phenomenon of pressure melting of ice. Barrie Jones with laboratory apparatus which investigates pressure melting of ice. He points out various component parts and explains how the apparatus works. Film shots of an experiment, using the apparatus above, which verifies the existence of pressure melting. A weight, penetrates a block of ice without signs of plastic deformation to the ice. Film shots of glacial ice in the Alps. Time lapse photography (l sec. to 330 hrs.) shows the movement of the ice. Film shots of experimental work being carried out in tunnels and caverns beneath the Argentiere glacier. Commentary by Paul Clark. Time lapse photography under the glacier shows the movement of the ice. Robert Vivian explains how the roughness of the rock over which the glacier passes actually facilitates movement because of the pressure melting phenomenon. More film shots of the tunnels and caverns under the glacier. Barrie Jones attempts to explain the pressure melting phenomenon and the density variations of the ice/water system with the aid of atomic models. Several animated diagrams are also used. Jones sums up with the aid of the PVT surface to water. |
| Master spool number: | 6HT/71055 |
| Production number: | 00525_1040 |
| Videofinder number: | 693 |
| Available to public: | no |
