They change from a liquid to a vapor (gas).
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Mercury will boil last, as it has a higher boiling point than water and alcohol. Mercury boils at around 674 degrees Fahrenheit, while water boils at 212 degrees Fahrenheit and alcohol at about 173 degrees Fahrenheit.
The boiling point of a liquid can change with air pressure. As air pressure decreases, the boiling point of a liquid also decreases, meaning it will boil at a lower temperature. Conversely, as air pressure increases, the boiling point of the liquid increases, requiring a higher temperature to boil.
A liquid, typically mercury or alcohol, is found in a thermometer.
Egg whites can turn from a liquid to a solid when boiled. The proteins in the egg whites denature and coagulate when heated, resulting in the transformation from liquid to solid.
For a liquid to boil, its vapor pressure must equal or surpass the pressure exerted on it by the surrounding environment. This typically occurs when the liquid reaches its boiling point, at which temperature its vapor pressure matches the surrounding pressure, causing bubbles of vapor to form within the liquid.