Available online
Description
The programme shows something of the techniques which may be used to simulate conditions existing in a monoatomic liquid
The programme shows something of the techniques which may be used to simulate conditions existing in a monoatomic liquid
| Module code and title: | ST285, "Solids, liquids and gases" |
|---|---|
| Item code: | ST285; 09 |
| First transmission date: | 02-06-1973 |
| Published: | 1973 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:23:20 |
| + Show more... | |
| Producer: | Andrew Millington |
| Contributors: | Paul Clark; Alan Walton |
| Publisher: | BBC Open University |
| Keyword(s): | Atoms in liquid; Ball and plaster models; Computers; Interatomic force; Liquid motion; Liquid structure; Modelling liquid; Potassium chloride; Radial distribution function; Sodium chloride |
| Footage description: | Film shots of oil covered ball bearings vibrating on a tray to simulate molecular motion in a liquid. Alan Walton with a home experiment kit. This determines, by simulation with marbles, the radial density of atoms in a liquid at certain distances from a central point. Walton plots his results in the form of a histogram. Paul Clark points out the two methods of obtaining a radial density curve, one analytical the other by simulation. He explains why simulation will be the method examined in this programme. Alan Walton discusses some of the pioneering work done by J.D. Bernal on simulation techniques. Still shot of Bernal while he talks. Walton continues his discussion. He examines one of Bernal's early models of liquid structure and explains how it was arrived at. Walton then looks at several more of Bernal's models of liquid structure and explains how these were arrived at. Paul Clark compares a plot of Bernal's radial density curve for a liquid with an X-ray data curve. A considerable measure of error is present. Walton with a graph showing a force/extension curve. He explains the shortcomings of Bernal simulation (lack of attractive and repulsive forces and lack of motion in the model). Shots of a vibrating model of a liquid made up of oil covered ball bearings. This simulates the motion and attractive forces of molecules. Walton with the force/extension curve obtained from the model. The curve is still not quite correct. He discusses ways in which better model might be built. Paul Clark discusses the advantages of computer over mechanical simulation for modelling molecular motion in liquids. Paul Clark and Alan Walton use several diagrams and a roulette wheel to explain how such a simulation is set up for the computer. Film shots of a computer simulation showing the motion of molecules in a liquid in three dimensions. Commentary by Clark explains the sort of motion which can be simulated. More film shots of the computer simulation showing motion of sodium and chlorine atoms together in liquid form. Walton sums up. |
| Master spool number: | 6HT/70886 |
| Production number: | 00525_1033 |
| Videofinder number: | 686 |
| Available to public: | no |
