Which of the following actions could a person do to show how heat moves through conduction? А
A camper melts some marshmallows by holding them over a campfire.
B
A person uses an electric blanket to warm up on a cold evening.
с
A chef waits as pasta noodles rise and fall in a pot of boiling water.
D
A farmer heats up a metal rod to use as a brand by placing it into a fire.

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.