Most substances can exist as a solid, liquid or gas. They can change state, usually when they are heated or cooled. For example, liquid water turns into water vapour when it is heated enough ...

Water is a huge part of the earth, covering about 70 percent of the planet’s surface. Water is an essential part of every living thing on earth, and exists in three main states of matter. Solid water ...

Preliminary findings of Richard Dasher from Stanford University’s US-Asia Technology Management Center & Amit Kapoor from ...