In this figure, what does O denote?

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Engineering Materials & Metallurgy Practice Test: Constitution of Alloys and Phase Diagrams — practice the complete quiz, review flashcards, or try a random question.

This quiz covers: Phases and phase diagrams, iron-carbon system and its alloys, iron carbide system, steel and cast iron transformation. Alloys are metallic compounds made up of one or more metals and non-metals. They are usually made by melting the substances, mixing them together, and then letting them cool to room temperature.  Examples of alloys include: Steel: A combination of iron (metal) and carbon (non-metal) Bronze: A combination of copper (metal) and tin (metal) Brass: An alloy formed by mixing two metals, copper and zinc  A phase diagram, also known as a constitutional... Show more

In this figure, what does O denote?<br /><br><img src='https://www.fatskills.com/engineering/engineering-materials-metallurgy-questions-answers-phases-phase-diagrams-q9.png' alt='The graph represents pressure-temperature diagram for one-component phase diagram' width='512' height='290' class='alignnone size-full wp-image-203807'>