What is the boiling point of water on the Celsius scale at standard atmospheric pressure?

• A. 212
• B. 100
• C. 373
• D. 0

Answer: (B)

Verified step by step guidance

1. Understand that the boiling point of a substance is the temperature at which its vapor pressure equals the external pressure. For water at standard atmospheric pressure (1 atm), this is a well-known reference point.
2. Recall that the Celsius scale is defined such that the boiling point of water at 1 atm is exactly 100 degrees Celsius.
3. Recognize that the other numbers given (212, 373, 0) correspond to boiling points in different temperature scales or reference points: 212°F is water's boiling point in Fahrenheit, 373 K is in Kelvin, and 0°C is water's freezing point.
4. Therefore, the boiling point of water on the Celsius scale at standard atmospheric pressure is the temperature where water transitions from liquid to gas, which is 100°C.
5. No calculation is needed here since this is a standard reference value in chemistry and thermodynamics.