Question

4- what is thermometer?
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Answer 1

Explanation:

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an instrument for measuring temperature

ज्‍वर या तापमान मापने का उपकरण; थर्मामीटर, तापमापी

Answer 2

A thermometer is a device that measures temperature or a temperature gradient. A thermometer has two important elements: a temperature sensor in which some change occurs with a change in temperature; and some means of converting this change into a numerical value.