Available online
Description
The programme reviews the basic definitions and processes required to set up the perfect gas temperature scale. It looks at the IPTS which coordinates various instruments measuring different temper...ature ranges.
The programme reviews the basic definitions and processes required to set up the perfect gas temperature scale. It looks at the IPTS which coordinates various instruments measuring different temper...ature ranges.
| Module code and title: | ST285, "Solids, liquids and gases" |
|---|---|
| Item code: | ST285; 11 |
| First transmission date: | 16-06-1973 |
| Published: | 1973 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:24:19 |
| + Show more... | |
| Producer: | Andrew Millington |
| Contributors: | Paul Clark; T J Quinn; Alan Walton |
| Publisher: | BBC Open University |
| Keyword(s): | Empirical temperature; Gas thermometer; International practical temperature scale; Measuring instruments; National Physical Laboratory; Perfect gas scale; Platinum resistance; Primary scale |
| Footage description: | Paul Clark introduces the programme with the aid of a PVT surface model. Paul Clark defines a fixed point of temperature. Alan Walton with experimental apparatus explains and demonstrates how a fixed point of temperature is determined. Paul Clark, with the PVT surface, explains the advantage of using the triple line as a fixed point of temperature. Alan Walton, with a constant volume gas thermometer, demonstrates how temperature of an unknown substance is related to the temperature of a fixed point. Alan Walton introduces a discussion on temperature scales. Paul Clark explains how points on a perfect gas temperature scale are fixed. T.J. Quinn, at the National Physical Laboratory, explains how the gas thermometer there is used to set up a temperature scale in the range 2 - 20 Kelvins. Alan Walton demonstrates temperature measurement with an optical pyrometer. He measures the temperature of the wire filament in a tungsten lamp. Paul Clark examines the principles behind the International Practical Temperature Scale and how this scale is related to the gas temperature scale. He uses a graphic board as an aid. Paul Clark explains how the Platinum Resistance Effect can be exploited to make a practical thermometer. An animated graph is used to illustrate the points. T.J. Quinn, at the N.P.L., explains how the platinum resistance thermometer might be extended in scale. Diagrams are used to illustrate the principles behind the apparatus. Paul Clark reviews some points on radiation from hot bodies. Graphs are used as visual aids. Clark shows a model of an experimental apparatus which measures radiation in different bands of wavelength and, as a result, temperatures of unknown hot bodies. T.J. Quinn, at the N.P.L., sets up the temperature scale above up to the freezing point of gold. Quinn explains how the apparatus for this works and then demonstrates. Paul Clark sums up. |
| Master spool number: | 6HT/70987 |
| Production number: | FOU1414D |
| Videofinder number: | 688 |
| Available to public: | no |
