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What is the pH scale? This is a scale from 0 to 14. It is used to describe a substance as acid, neutral, or alkali. Numbers below 7 are acid, 7 is neutral (neither acid nor alkali), and numbers above 7 are alkali.
Science in ContextThis link opens in a new windowScience in Context is an engaging online experience for those seeking contextual information on hundreds of today's most significant science topics. The solution merges Gale's authoritative and continuously updated reference content with full-text magazines, academic journals, news articles, experiments, images, videos, audio files and links to vetted websites organized into a user-friendly portal experience.
Global Issues in ContextThis link opens in a new windowGlobal Issues in Context offers international viewpoints on a broad spectrum of global issues, topics, and current events. Featured are hundreds of continuously updated issue and country portals that bring together a variety of specially selected, highly relevant sources for analysis of these issues. Rich multimedia - including podcasts, video, and interactive graphs - enhance each portal. Use Browse Issues and Topics, Country Finder, Basic Search or Advanced Search to explore the database.