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

A solid, liquid, & gas at the same time – The Triple Point

How can a chemical be a solid, a liquid, and a gas at the same time? In the video above, a clear liquid called cyclohexane is experiencing the perfect pressure and temperature combination for its solid, liquid, and gas phases to co-exist within a repeating cycle. It’s called the triple point:

In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.

Sujata Kundu, Alistair Linsell, and Helen Arney explain the details in this clip from The Science Channel’s Outrageous Acts of Science. You can also find this handy Table of Triple Points on Wikipedia.

There’s more freezing, boiling, and pressure to watch in the archives. Try this one: Kari Byron makes a cloud in a bottle.

🌈 Related videos

Soap, water and corn syrup bubbles freezing

Rion Nakaya

How to make a self-starting siphon

Rion Nakaya

The Geysers of Yellowstone National Park in action

Rion Nakaya

Throwing a pot full of just-boiled water into the -41C air

Rion Nakaya

Melting Ice With Salt

Rion Nakaya

Dancing Mud: the bubbling mud pots in Rotorua, New Zealand

Rion Nakaya

The Tea Twister – The science behind Teh Tarik (pulled tea)

Rion Nakaya

Sculpting in Solid Mercury using Liquid Nitrogen

Rion Nakaya

Leidenfrost Maze: Self-propelled droplets on a hot jagged surface

Rion Nakaya

Get 7 smart videos delivered every week.

 

Subscribe