# @stem_antics on Instagram

- **Type:** Video
- **Original URL:** https://www.instagram.com/p/DWIVI-WgNHw
- **Gondola URL:** https://gondola.cc/posts/61935805-stem-antics-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/4b4c3a748b.jpg
- **Posted:** 2026-03-21T02:46:49.000+00:00
- **Account Owner:** Stem Antics (@stem_antics) — https://gondola.cc/stem_antics

## Caption

Zinc doesn’t behave the way most metals do when heated—and that’s what makes this demo so powerful.

At standard atmospheric pressure, zinc transitions from solid to liquid at 419.5 °C, then rapidly reaches its boiling point at 907 °C. That relatively low boiling point (for a metal) means you can observe a full phase change sequence—solid → liquid → vapor—within a single controlled lab setup.

But the real story starts in the vapor phase.

When zinc vapor leaves the hot zone and encounters oxygen, it oxidizes almost instantly to form zinc oxide (ZnO). This reaction is highly exothermic and produces the characteristic white “smoke” plume. What you’re seeing isn’t just boiling—it’s a coupled phase transition and oxidation reaction happening in real time.

Zn (g) + 1/2 O₂ (g) → ZnO (s)

At high temperatures, ZnO can briefly emit a yellow glow due to oxygen vacancies in its crystal lattice. As it cools, it returns to its stable white form. That color shift is a direct window into defect chemistry and electronic structure.

This experiment connects thermodynamics (phase diagrams, vapor pressure), kinetics (rapid oxidation rates), and materials science (crystal defects and emission behavior) in one sequence.

If you had to explain what’s happening here in one sentence, how would you describe it?

Save this to revisit phase changes and oxidation reactions. Share it with someone who thinks metals don’t “boil.” Follow for more high-signal STEM breakdowns.

#STEM #Chemistry #MaterialsScience #PhaseChange #Thermodynamics

## Stats

- **Views:** 1,638
- **Likes:** 66
- **Shares:** 0
- **Comments:** 2

## Tags

stem, materialsscience, chemistry, phasechange, thermodynamics

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