Question

Water has maximum density at a temperature of

• A. 0° C
• B. 100° C
• C. 4° C
• D. None of the above

Answer 1

The correct option is C 4° C

Water is one of the few exceptions to this behaviour. When water is cooled, it contracts like one would expect until a temperature of approximately 4° C is reached. When it is cooled below 4° C, it expands slightly until it reaches the freezing point. Thus at 4°C, it has minimum volume and maximum density.