* As a proper noun: When referring to the Pacific Ocean (a specific body of water), you capitalize it.
* Example: "We sailed across the Pacific Ocean."
* As a common noun: When referring to something being peaceful or calm, you don't capitalize it.
* Example: "The meeting had a pacific atmosphere."
* As part of a place name: When part of a specific location, you capitalize it.
* Example: "We visited Pacific Grove, California."
In short, capitalize "Pacific" when it refers to the ocean or a specific location, but not when used as a general adjective.