Under standard atmospheric pressure, between what temperatures can water exist as a liquid?

• A. -10°C and 90°C
• B. 0°C and 100°C
• C. 30°C and 80°C
• D. 0°C and 373K

Answer: (B)

Water can exist as a liquid between 0°C and 100°C under standard atmospheric pressure (1 atm). This temperature range defines the conditions in which water is in its liquid state. At 0°C, water freezes into ice, while at 100°C, it boils and transforms into steam. This physical property is fundamental to understanding phase changes and the behavior of water in various applications, including those related to heating and cooling systems.

The choice that includes the temperature range from 0°C to 100°C accurately represents the limits for water's liquid state in normal atmospheric conditions, making it the correct answer. The other options either do not provide a complete or accurate range for the existence of liquid water or include temperatures that fall outside the standard boiling and freezing points of water.