Answer: Thermometer (thermos: hot; metron: measure) is the universal instrument used to measure temperature. Temperature and heat are two words that often confuse people. For example, how do you explain the hotness of an object? What is the measure or basis for that hotness? The answer to that is temperature. Heat is a form of energy and its unit is Joules. On the other hand, Temperature is the measure of that heat. This means, if the heat is more, the temperature is more than well. But how do we measure temperature? We use a device called thermometer to measure the temperature of any object.
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