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For the construction of a thermometer one of the essential requirements is a thermometric substance which

1. remains liauid over the entire range of temperatures to be measured
2. has a property that varies linearly with temperature
3. has a property that varies with temperature
4. obey Boyle's law

Correct answer: has a property that varies linearly with temperature

Solution

A thermometric substance must have a property that changes uniformly with temperature so the thermometer scale can be calibrated accurately. Linear variation makes the relationship between the measured property and temperature simple and reliable.

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