The primary difference between a scientific theory and a scientific law is that a law:
allows scientists to predict how physical phenomenon will behave
explains why some physical phenomenon behave as they do
has been heavily tested through repeated experimentation
is a scientific model

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

What was the purpose of the apollo program? to put a man in orbit to launch a spy satellite to launch a space station to put man on the moon