2. Estimate the value of mass transfer coefficients, kc and kG, in large of stream of air at 273K flowing in a duct past the flat plate of solid naphthalene with length of 40 cm. The velocity of the air is 0.82 m/s at 273K and 1 atm abs. The diffusion coefficient of naphthalene in air at 273K and 1 atm abs is 5.16x10-6 m2 /s

a.   mass number from atomic number

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.