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In physics, a black body (in an ideal sense) is an object that absorbs all electromagnetic radiation that falls on it, without any of the radiation passing through it or being reflected by it. Because it does not reflect or transmit visible light, the object appears black when it is cold. When heated, the black body becomes an ideal source of thermal radiation, which is called black-body radiation.

The peach (Prunus persica) is a tree native to China that bears an edible, sweet, juicy fruit of the same name that is very popular throughout the world. It is a deciduous tree which grows 5–10 meters tall and belongs to the subfamily Prunoideae. Nectarines are also considered a type of peach, being of the same species. While the fruit and flowers of the peach tree provide for the individual purpose of reproduction of the peach species, these and the tree itself also provide for larger purposes for the ecosystem (food and habitat for animals) and for humans (nutritional, commercial, and aesthetic values). For humans, the peach fruit is nutritious, providing vitamins, minerals, fats, proteins, sugars, and other items that promote human health.