Substances can exist in three states of matter - solid, liquid and gas. Substances can change states. To change the state of a substance energy must be transferred to, or from, the substance.

Although the three states of matter are solid, liquid, and gas, not all substances seem to fit perfectly into one of these groups. Take a look at the substance below and see if you can decide whether ...

HOUSTON, May 8 (Reuters) - U.S. exports of natural gas liquids touched a record high ... are the latest energy products ensnared in the escalating trade war between the world's two largest economies.