Question

But what is the first stage of sublimaion and last step of sublimation

Answer 1

Answer:

first stage of sublimation is solid and last stage is as of gaseous form

Answer 2

Answer:

in 1st stage the substance will start to convert to gas from solid and in last stage all the solid form will be converted to gas if container is open .

in a closed container sublimation will continue till there is equilibrium between solid and gas state