Calculate the energy released during deposition — the reverse of sublimation where gas transforms directly into solid without becoming liquid
See gas molecules slow down and crystallize into solid structure
The exothermic process of gas converting directly to solid
Deposition is the phase transition where a gas transforms directly into a solid without passing through the liquid phase. It is the exact reverse of sublimation and is an exothermic process — it releases energy to the surroundings.
Frost forming on cold surfaces, snow forming in clouds, and chemical vapor deposition (CVD) in semiconductor manufacturing are all deposition processes.
Since deposition is the reverse of sublimation, the energy released equals the latent heat of sublimation. The gas molecules lose kinetic energy and form crystal lattice bonds.
Q(released) = m × L, where m is mass and L is the latent heat. The gas also cools from its initial temperature, releasing sensible heat: Q₁ = m × c × ΔT.
Calculate the energy released when gas deposits directly into solid form
Enter gas parameters to calculate the energy released during deposition (gas → solid).
Deposition is the phase transition where gas converts directly to solid without passing through the liquid state. It's the reverse of sublimation. Common examples include frost formation on cold surfaces and snow crystal growth in clouds.
Deposition is always exothermic — it releases energy. When gas molecules slow down and form crystal bonds, they release their kinetic energy and latent heat to the surroundings. This is why frost often forms on the coldest surfaces first.
Frost forms when water vapor in the air contacts a surface below 0°C. The vapor deposits directly into ice crystals without becoming liquid water first. The beautiful frost patterns result from the crystal growth following the surface's temperature gradients.
CVD is an industrial process where gaseous precursors react and deposit as a thin solid film on a substrate. It's crucial in semiconductor manufacturing for creating silicon wafers, coating tools with diamond-like carbon, and producing optical fibers.
Deposition releases exactly the same amount of energy that sublimation absorbs — the latent heat of sublimation. For water, this is approximately 2,830 kJ/kg. For CO₂, it's 571 kJ/kg. This energy is released as heat to the surroundings.
Yes, for certain substances. Iodine vapor can deposit back into crystals on cool surfaces at room temperature. Naphthalene vapor from mothballs can deposit on nearby cold objects. The key requirement is that the surface temperature must be below the substance's sublimation point.