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Topic Content:
- Platinum Resistance Thermometer
This thermometer consists of a long thin platinum wire wound round a small spool made of silica or mica. It uses the linear variation in the resistance of a platinum wire. The resistance of the wire changes proportionally with its temperature. The higher the temperature the greater its resistance.
The ends of the wire are connected to a resistance measuring device, for example, a Wheatstone Bridge .
The thermometer can measure accurately between
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