The Boiling Point of Water — Passage

Water is a substance we use every day—for drinking, cooking, cleaning, and more. But have you ever noticed what happens when you heat water long enough? It starts to bubble and turn into steam. This is called boiling, and the temperature at which it happens is called the boiling point.

The boiling point of water is 100 degrees Celsius (°C.. That means when water reaches 100°C, it changes from a liquid to a gas. This gas is called water vapor or steam. In the Kelvin temperature scale, the boiling point of water is 373.15 K.

Boiling point is a physical property. This means that when water boils, it changes its state—from liquid to gas—but it’s still water (H₂O). The molecules move faster as they gain heat, and they spread out, turning into vapor.

The boiling point can change depending on air pressure. At higher altitudes, like on a mountain, water boils at a lower temperature because the air pressure is lower. That’s why it takes longer to cook pasta in high places!

Boiling point is important in everyday life and science. It helps us cook food, clean tools with steam, and understand weather patterns like evaporation and cloud formation.

In summary, water boils at 100°C or 373.15 K, turning from liquid to gas. This simple but powerful process is a key part of the water cycle and many science experiments.

Fun Fact : At the top of Mount Everest, water boils at just about 70°C (158°F)—that’s so low, it’s hard to make a proper cup of tea!