Which two options describe physical properties of matter? A.
Whether a substance can be burned
B.
Whether a substance floats or sinks in water
C.
The temperature at which a substance boil
D.
The ability of a substance to combine with other substances
E.
Whether a substance tarnishes

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.