PHYSICS Lecture Notes - Lecture 16: Electrical Resistance And Conductance, Prope, Thermocouple
Document Summary
Ice melts oncl water boils at well-defined temperatures (fixecl pointsj wrich may be used to calibrate thermometers: these fixed points allow you to know the temperature without having to measure it directly, usually two fixed points are used: The lower fixed point: the melting temperature of ice. The upper fixed point: the boiling temperature of pure water: once a property (such as electrical resistance) has been measured at these two fixed points, the values of that property at other temperatures can be worked out. Measuring some proper ty nt two ffixed points allows you to then work out tic temperature for other on/ucs of thnt proper ty. If a liquid -thermometer is too short, there may not be enoug h room for the liquid to expand into. Of usd is the bujb is heated, the liquid exponcfs and moves a/ong the copijjory tube.
