Water density is greatest at 4 degrees Celsius (O degrees Celsius = 273K, so 4 degrees Celsius = 277K).

When the temperature decreases to 0 Celsius, the density of water decreases to 0.999 g/cm^3 and the volume increases about 10%.

0 degree cel = 273k

ie

4°C = 273+ 4

= 277k

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The freezing point of water is 0°C

… (32°F, 273 K). …..

In the absence of nucleators water will supercool to as low as −70°C (−94°F, 203 K) before freezing. [1] But in the presence of nucleating substances the freezing point of water is the same as the melting point. Nucleating agents, such as dust, are commonly present in the environment, which is why rain water and tap water will normally freeze at the melting point of water.

http://en.wikipedia.org/wiki/Freezing

Water attains its maximum density at a temperature of 4° C (39° F) and expands upon freezing. Like most other liquids, water can exist in a

http://encarta.msn.com/encyclopedia_761573158/Water.html

The Kelvin scale is a thermodynamic (absolute) temperature scale where absolute zero — the coldest possible temperature — is zero kelvin (0 K).

http://en.wikipedia.org/wiki/Kelvin

273k is the freezing point of water. However when water freezes it expands.

277k is above freezing but not hot enough for the liquid to become a gas.

In fact water is most dense at 4 degrees C. So 277k is the closest to this point (3.85 degree C to be exact)

Water is most dense at -4 degrees celcius.

This is why ice always floats on water.

This means water at -4 degrees is more denser than the ice.

The answer is [B.277k?]

ummmmmm…………

D?