A small pond of depth 0.5 m deep is exposed to a cold winter with outside temperature of 263 K. Thermal conductivity of ice is K = 2.2 W m –1 K –1 , latent heat L = 3.4 × 10 5 Jkg –1 and density ρ = 0.9 × 10 3 kgm –3 . Take the temperature of the pond to be 273 K. The time taken for the whole pond to freeze is about.
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