A thermometer is placed in a test-tube of liquid

 

Test-tube and thermometer2

A thermometer is placed in a test-tube of liquid. The temperature of the liquid is recorded every half minute.

time 0 0.5 1 1.5 2 2.5 3
temperature °C 55 49 43 43 43 39 36

 

What is the melting point of the substance?

Solution.

The melting point, temperature at which the solid and liquid forms the substance can exist in equilibrium. The melting point can be determined by monitoring the temperature of the liquid with time. When the freezing point is reached, the temperature of the substance will no longer drop until all the liquid has frozen. Thereby, the answer is 43 °C.

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