Question

Carmen is heating some water and trying to measure the temperature of water using a Celsius thermometer. Which measurement can she expect once the water begins to boil?

Answer 1

Right around 100° C, depending on the purity of the water and the barometric pressure.

Answer 2

Answer: The pure water boils at 100°C. So she should measure a value around this. But the boiling point also depends on the barometric pressure and the "pureness" of the water. So if for example, she is in a place with low pressure, such as a high mountain, the water will boil at a temperature less than 100°C.