a full pan water is placed on an electric stove burner at sea level. The dial is

Question

a full pan water is placed on an electric stove burner at sea level. The dial is set to low and the water is brought slowly to a low boil. A fahrenheit thermometer is placed into the steadily boiling water, and after a few minutes the thermometer stabilizes at 212 ferinhight. The stove's dial turns to high and the burner becomes bright orange. The boiling becomes more rapid, almost violent. After 15.0 minutes of rapid boiling, half of the water in the pan is gone. The thermometer is read a second time. a.) How do the first and second readings of the thermometer compare? b.) Explain.

Explanation / Answer

Both first and the second reading corresponds to 212 fahrenheit which is the boiling point of water.

The first reading is observed when the dial is set at low and the water starts boiling.

After that when the dial is set at high, the extra heat provided by the burner is stored in the water as "latent heat'. Latent heat is the heat required to convert a solid into a liquid or vapour, or a liquid into a vapour, without change of temperature. In this case, after the water starts boiling, the extra heat is used for conversion of water into water vapours without the change in temperature.

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