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Question

You can use a mercury thermometer to accurately infer whether mercury expands linearly with temperature


A
True
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B
False
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Solution

The correct option is B False

No! You cannot use the thermometer to verify the linear expansion of mercury. This is because the temperature scale itself is defined by making equal markings between 00 C and 1000 C, assuming that mercury expands linearly.

In fact, scientists have now established using statistical physics and other concepts that mercury does not expand exactly in a linear fashion.

Before all this, the only way to guess if a thermometer fluid is a good choice (i.e, expands linearly) was to observe which of them gave consistent results.


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