The boiling point is the temperature at which a liquid turns into vapor because its vapor pressure equals atmospheric pressure.

Why it matters:

• Different substances have unique boiling points used for identification
• Crucial in distillation, cooking, industrial processes, and chemistry
• Changes with altitude—lower pressure means lower boiling point

Examples:

• Water boils at 100°C at sea level
• At high mountains, it boils around 90–95°C