It is not uncommon for the night sky temperature in desert regions to drop to -20°c. if the ambient air temperature is 20°c and the convection coefficient for still air conditions is approximately 5 w/m2·k, estimate the water surface temperature, ts, in k.

A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.