A lab worker puts several mL of a liquid into a test tube and equips the test tube with a thermometer. A bunsen burner is set up underneath the test tube and a low flame is turned on. The lab worker is most likely trying to determine the liquid's:

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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c) should be the answer.