Unpack gas: its meaning, definition, etymology (from 'chaos'), and diverse examples across states of matter, fuel, and informal uses. Explore its multifaceted nature. 

Explore "chemical": its meaning, definition, and fascinating etymology rooted in alchemy. Discover diverse real-world examples and linguistic applications of this fundamental scientific term.

Explore the fascinating world of "biochemistry," the science of life at a molecular level. Discover its origins, meaning, and real-world applications.