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A thermometer uses :...

A thermometer uses :

A

water

B

mercury

C

air

D

none of the above

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "A thermometer uses:", we can follow these steps: ### Step 1: Understand the question The question is asking about the substance used in a thermometer. We have multiple options: water, mercury, air, or none of these. ### Step 2: Analyze the options - **Water**: While water can expand with temperature changes, it has a low coefficient of expansion, which means it does not change volume significantly with small temperature changes. - **Mercury**: Mercury has a high coefficient of expansion, meaning it expands significantly with small changes in temperature. This makes it very effective for use in thermometers. - **Air**: Air also has a low coefficient of expansion, similar to water, and is not used in traditional thermometers. - **None of these**: This option would imply that the thermometer uses a substance not listed, which is not the case here. ### Step 3: Determine the best option Given the analysis, mercury is the most suitable substance for use in thermometers due to its high coefficient of expansion, allowing for accurate temperature readings. ### Step 4: Conclusion Therefore, the correct answer is **B) mercury**. ---
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