Glossary

gas

Something that does not have a definite shape or volume is a gas. For example, the oxygen that we breathe, is a gas. The air that comes out from our mouth and nose is a gas.

Picture source:

http://cache.eb.com/eb/image?id=93820&rendTypeId=4

Select this then click anywhere in the book to start reading text Speak the current selection Stops speech playback Double-click a word in the book and click this icon to translate the word into Spanish