How did Louis Pasteur’s experiments lead to new scientific understandings of germs? Experiments with cooking food showed that disease-carrying germs in food could be killed when heated. Experiments with different magnification lenses showed that germs were real and could be observed. Experiments with animals showed that dominant genes could lead to risks of disease. Experiments with shallow dishes showed that groups of germs could be grown so they could be seen without microscopes.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.