Get smart curated videos delivered to your inbox.   SUBSCRIBE
The Kid Should See This

Triple Point of Water Demonstration

Watch more with these video collections:

Ice water sits on a plate in a vacuum chamber. With the pressure lowered, the liquid water begins to boil while ice cubes remain. This is the triple point of water, as shared in this silent video by the UC Santa Cruz Physics Demonstration Lab at UCSC Physics.

The triple point occurs where the solid, liquid, and gas transition curves meet. The triple point is the only condition in which all three phases can coexist, and is unique for every material. Water reaches its triple point at just above freezing (0.01° C) and at a pressure of 0.006 atm.

triple point of water demonstration

Related reading: Thermodynamic equilibrium.

Learn more about triple points with this cyclohexane video from Outrageous Acts of Science.

Plus, videos about freezing, boiling, and pressure. And why is water one of the weirdest things in the universe?


This Webby award-winning video collection exists to help teachers, librarians, and families spark kid wonder and curiosity. TKSST features smarter, more meaningful content than what's usually served up by YouTube's algorithms, and amplifies the creators who make that content.

Curated, kid-friendly, independently-published. Support this mission by becoming a sustaining member today.

🌈 Watch these videos next...

Why Most Rain Never Reaches The Ground

Rion Nakaya

Why is water one of the weirdest things in the universe?

Rion Nakaya

Why Do Rivers Curve? – MinuteEarth

Rion Nakaya

What is groundwater?

Rion Nakaya

What happens when you put marshmallows in a vacuum?

Rion Nakaya

Warka Water towers harvest drinkable water from the air

Rion Nakaya

Thermal expansion sphere and ring demonstrations

Rion Nakaya

The Water Cycle: A boogie woogie stop motion clay animation

Rion Nakaya

Oobleck, Non-Newtonian Fluids, and Normal Stuff in Not-So-Normal Places

Rion Nakaya