All thermometers use the value of a physical property to measure temperature. State what makes a physical property suitable for the measurement of temperature.
- (a)(i)All thermometers use the value of a physical property to measure temperature. State what makes a physical property suitable for the measurement of temperature.[1]
- (a)(ii)State two properties that are used for the measurement of temperature. 1. 2.[2]
- (b)(i)When a thermometer is calibrated, two fixed points are used. One fixed point is the ice point. State what is meant by the ice point.[1]
- (b)(ii)Explain how the fixed points are used when calibrating a thermometer.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.
- [1] (the property) varies with temperature
- [2] any two from: volume (of gas/liquid) or density or length (of thread) voltage or current or e.m.f. resistance pressure (of gas) colour (quantity of) radiation emitted liquid crystal structure
- [1] temperature of melting ice/where water freezes or water/ice mixture
- [1] immerse thermometer in melting ice/at the ice point or boiling water/at steam point
- [1] or ice point and steam point marked/found (may be implied) divide the difference into 100 units/sections
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