How real glass is made
Window and bottle glass is mainly silicon dioxide from sand. Pure silica melts at a very high temperature, so glassworks mix in a flux such as soda ash, plus limestone, to lower the melting point before melting the batch in a large furnace. Cooled before crystals can form, the melt becomes clear glass.
| Stage | What happens |
|---|---|
| Raw materials | Silica sand + flux (soda ash etc.) + limestone |
| Melting | Fully melted in a furnace at high temperature |
| Forming and cooling | Blown or poured into shape, then cooled slowly |
Melting sand at home is dangerous and practically impossible. If you want to see the idea, a game is enough.
Glass made by nature
Nature sometimes makes sand into glass too. When lightning strikes sand, the sudden heat can melt it into hollow glassy tubes called fulgurites. Obsidian, formed when thick magma cools fast, is natural glass whose crystals never had time to grow. In both cases the key is extreme heat and fast cooling.
The game recipe
Pour lava onto sand
In Sandlab, pile up Sand and pour Lava on top of it or next to it. Sand grains touching the lava gradually turn into glass. It does not happen all at once; each grain has a chance per moment, so give it a few seconds.
Why fire alone does not work
The in-app Reaction guide says sand melts in "the heat of lava or fire", but in the 1.0 engine the condition that turns sand into glass is touching lava. Fire sprinkled on sand just rises and burns out. Real sand will not melt in a campfire either, so this part is actually close to reality.
Keep water away
Lava that touches water instantly hardens into stone and the water turns into steam. If you want glass, keep water away from the lava. Once the lava has become stone it cannot heat the sand.
What glass is good for
| Property (in the game) | Use |
|---|---|
| A solid that stays in place once formed | A glass crust over a sand pile, like a roof |
| Acid cannot dissolve it (only glass and stone) | A container for acid. The Tube wall preset is drawn in glass |
| Does not burn | A divider for fire and lava experiments |
Glass is a premium element, so picking it straight from the palette takes one short ad, but making it from sand and lava works from the start.
FAQ
Does glass ever turn back into sand?
Not in the game. Glass stays as a fixed solid and only disappears with the eraser or undo.
Can electricity make glass instead of lava?
Spark runs along metal, water and acid and sets things on fire, but it does not turn sand into glass. Lightning glass is not part of the game rules.
Sandlab - Falling Sand Physics
No sign-up, and the simulation runs fully offline. Your canvases stay on your device. Free on Android.