DE Which describes the process of the forming of water vapor?
At the heat of vaporization point, absorbed thermal energy changes water from a gaseous state to a solid state.
At the heat of vaporization point, absorbed energy changes water from a liquid state to a gaseous state.
At the heat of fusion point, released energy changes water from a gaseous state to a solid
state.
At the heat of fusion point, released energy changes water from a liquid state to a solid state.

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.

gas and precipitate r the correct answers