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Hot Weekly Deals: Every week, the staff at 7 blue seas scrutinizes the latest cruise offers and presents onsite the best of the best on the hot weekly deals page.

Photosphere: The intensely bright portion of the sun visible to the unaided eye; the 'surface' of the sun. Reaching temperatures estimated at about 11,000°F, it is the portion of the sun's atmosphere wh . . . View Full Definition

Photosynthate: A substance synthesized in the process of photosynthesis

Photosynthesis: The process by which plant cells use solar energy to produce ATP. The conversion of unusable sunlight energy into usable chemical energy, associated with the actions of chlorophyll.

Photosynthetic Quotient: In photosynthesis, the moles of oxygen produced, divided by the moles of carbon dioxide assimilated

Photorespiration: Enhanced respiration of plants in the light relative to dark respiration

Photoperiodism: The ability of certain plants to sense the relative amounts of light and dark in a 24-hour period; controls the onset of fiowering in many plants.

Photometer: Any of a number of atmospheric phenomena which appear as luminous patterns in the sky. They do not directly cause adverse weather. They include halos, coronas. rainbows, and fogbows.

Photomicrography: System of producing larger than life photographs by attaching a camera to a microscope.

Photon: A discrete packet of energy associated with electromagnetic radiation. Each photon carries energy E proportional to the frequency nu of the radiation: E = hnu, where h is Planck's constant.