In a standard climate, what is the boiling point of water at sea level?

In a standard climate, what is the boiling point of water at sea level?

• A. 90°C
• B. 100°C
• C. 110°C
• D. 120°C

Answer: (B)

The boiling point of water at sea level is defined as 100°C. This temperature coincides with international standards for defining boiling points of pure substances, specifically water, at a pressure of one atmosphere (101.3 kPa). At this pressure, the energy of the molecules in water is sufficient to overcome the intermolecular forces holding them in the liquid phase, enabling the transition to the gas phase. Variations in pressure can affect the boiling point; for instance, at higher altitudes where atmospheric pressure is lower, water boils at temperatures below 100°C. Conversely, under increased pressure, such as in a pressure cooker, water can boil at temperatures above 100°C. It’s important for students to recognize the standard conditions that determine boiling points, and for water, 100°C at sea level remains a fundamental constant in physical science.

The boiling point of water at sea level is defined as 100°C. This temperature coincides with international standards for defining boiling points of pure substances, specifically water, at a pressure of one atmosphere (101.3 kPa). At this pressure, the energy of the molecules in water is sufficient to overcome the intermolecular forces holding them in the liquid phase, enabling the transition to the gas phase.

Variations in pressure can affect the boiling point; for instance, at higher altitudes where atmospheric pressure is lower, water boils at temperatures below 100°C. Conversely, under increased pressure, such as in a pressure cooker, water can boil at temperatures above 100°C. It’s important for students to recognize the standard conditions that determine boiling points, and for water, 100°C at sea level remains a fundamental constant in physical science.