What is the pressure when a liquid is boiling at its normal boiling point?

Question

BlackTom AI · Accepted Answer

When analyzing the concept of boiling at the normal boiling point, the key idea is that boiling occurs when a liquid's vapor pressure equals the surrounding external pressure.
Option 0 kPa: This would imply near-vacuum conditions, which does not match the standard external pressure at which boiling occurs for the normal boiling point. Therefore, this choice is incorrect.
Option 101.3 kPa: This value corresponds to 1 atmosphere, the conventional external pressure used to define the normal boiling point for many liquids. At this pressure, the liquid’s vapor pressure equals the surrounding pressure, enabling boiling to occur at the normal boiling temperature. This makes the choice consistent with the definition of the normal boiling point. Therefore, this option is correct.
Option 202 kPa: This is greater than 1 atm and does not represent the external pressure at the normal boiling point. While a liquid can boil under higher external pressure at a different temperature, it does not describe the normal boiling condition. Hence, this is incorrect.
Option 505 kPa: This is significantly higher than atmospheric pressure and similarly does not describe the normal boiling point condition. It would correspond to a much higher boiling temperature, not the normal one, so this option is incorrect.

What is the pressure when a liquid is boiling at its normal boiling point?单项选择题

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