# @stem_antics on Instagram

- **Type:** Video
- **Original URL:** https://www.instagram.com/p/DVlubDFgFS1
- **Gondola URL:** https://gondola.cc/posts/61935820-stem-antics-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/46e0a9f9b5.jpg
- **Posted:** 2026-03-07T16:12:53.000+00:00
- **Account Owner:** Stem Antics (@stem_antics) — https://gondola.cc/stem_antics

## Caption

Glassblowing is a 2,000-year-old craft that doubles as a live demonstration of materials science, thermodynamics, and fluid dynamics.

Most glass used in studios is soda-lime glass, primarily silicon dioxide (SiO₂) mixed with sodium carbonate and calcium oxide. At room temperature it behaves like a brittle solid. But once heated above roughly 1,900°F (about 1,040°C), the material enters a working range where its viscosity drops dramatically and it flows like an extremely thick liquid.

That transition is what makes shaping possible.

A glassblower gathers molten glass from a furnace on the end of a hollow steel blowpipe. Air blown through the pipe forms a bubble inside the viscous mass, while constant rotation counters gravity so the glass doesn’t slump or fall off the rod. Tools, gravity, centrifugal force, and heat gradients all become part of the shaping process.

Temperature control is everything. The glass repeatedly moves between the furnace, a reheating chamber called a glory hole, and the workbench. Small differences in temperature can change viscosity enough to determine whether the material stretches, thickens, collapses, or holds its form.

Once the piece is shaped, it cannot simply cool in open air. Rapid cooling would create internal stress due to uneven contraction, often causing the glass to crack or shatter. Instead, finished pieces are placed in an annealing oven where they cool slowly over hours. This controlled cooling allows the glass structure to relax and distribute stress evenly.

What looks like an artistic performance is actually a precise balance of chemistry, physics, and engineering.

Glassblowing is one of the clearest examples of STEM concepts you can see with your own eyes: heat transfer, viscosity, pressure, structural stress, and material phase behavior all happening in real time.

What part of the process surprised you the most?

Save this if you enjoy seeing real science behind traditional crafts, and share it with someone who loves physics in the real world.

#stem #stemeducation #materialscience #glassblowing #scienceeverywhere

## Stats

- **Views:** 11,747
- **Likes:** 256
- **Shares:** 0
- **Comments:** 6

## Tags

stem, materialscience, stemeducation, scienceeverywhere, glassblowing

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