# data[].attributes.attachment_link.title
Newsela | Matter and Energy: What is matter?

# data[].attributes.attachment_link.description
The three most familiar states of matter are solid, liquid and gas.

# data[].attributes.attachment_link.title
Newsela | 10 interesting things about water

# data[].attributes.attachment_link.description
Earth's atmosphere deals with pollution from many sources, most of them man-made.

# data[].attributes.attachment_link.title
Newsela | Inge Lehmann: The scientist who discovered Earth's solid core

# data[].attributes.attachment_link.description
Danish seismologist Inge Lehmann once said to a nephew: "You should know how many incompetent men I had to compete with-in vain" in the mathematical and scientific community.

# data[].attributes.attachment_link.description
Blog | About TodaysMeet | Need Help? | Privacy Policy | Terms of Service | © 2008-2018 TodaysMeet LLC

# data[].attributes.attachment_link.description
Blog | About TodaysMeet | Need Help? | Privacy Policy | Terms of Service | © 2008-2018 TodaysMeet LLC

# data[].attributes.attachment_link.description
Blog | About TodaysMeet | Need Help? | Privacy Policy | Terms of Service | © 2008-2018 TodaysMeet LLC

# data[].attributes.attachment_link.readable_text
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.

We also recommend...

# data[].attributes.attachment_link.title
A solid, liquid, & gas at the same time - The Triple Point

# data[].attributes.attachment_link.description
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.

# data[].attributes.body
Use pages 41-44 in your science book to identify properties of matter. Record your answers in your science packet.

# data[].attributes.attachment_link.title
How Can This Chemical Be a Solid, Liquid, and Gas at the Same Time?