At what temperature does pure water freeze under standard atmospheric pressure?

• A. 32~^ext{o}ext{C}
• B. 0~^ext{o}ext{C}
• C. -10~^ext{o}ext{C}
• D. 100~^ext{o}ext{C}

Answer: (B)

Verified step by step guidance

1. Understand that the freezing point of a substance is the temperature at which it changes from liquid to solid under a given pressure.
2. Recognize that the problem specifies pure water under standard atmospheric pressure, which is 1 atm.
3. Recall that the standard freezing point of pure water at 1 atm pressure is a well-established physical constant.
4. Identify that this temperature is the point where water molecules arrange into a solid crystalline structure (ice).
5. Conclude that the freezing point of pure water under standard atmospheric pressure is 0~^\text{o}~\text{C}.