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What scientific tool would be the most helpful when measuring the temperature of a substance that is undergoing a phase change?

User Ryan McCue
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a thermometer is the correct answer

User Christopherbalz
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A thermometer may be used as a scientific tool for recording the temperature changes in substance, that is undergoing the phase change. For example, we can measure the temperature of ice which is melting down and becoming liquid, from solid.
User Steve Willard
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