For the construction of a thermometer, one of the essential requirements is a thermometric substance which
A
remains liquid over the entire range of temperatures to be measured
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B
has a property that varies linearly with temperature
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C
has a property that varies with temperature
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D
obey Boyle's law
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Solution
The correct option is B has a property that varies linearly with temperature The temperature is measured by the value of the thermodynamic property of a substance i.e. the property which varies linearly with the temperature.