Science / Weather / Fusion: The change of state from a solid to a liquid at the same temperature. The heat of fusion is the number of gram calories of heat necessary to change one gram of a substance from the solid to the liquid state. It is the opposite of freezing.
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Science / Chemistry / Nuclear Fusion: Combination of two smaller nuclei to form a larger nucleus. The larger nucleus has higher binding energy per nucleon than the original nuclei, and fusion results in the release of energy. MORE
Science / Chemistry / Diffusion Rate: The number of randomly moving molecules that pass through a unit area per second. Diffusion rates are fastest when a large concentration difference exists on either side of the unit area. Diffusion ra MORE
Science / Biology / Diffusion: The spontaneous movement of particles from an area of higher concentration to an area of lower concentration. MORE
Entertainment / Photography / Acceptable Circle Of Confusion: The size of the largest circle which the eye cannot distinguish from a dot. In 35mm format cameras, a 0.03mm diameter circle of confusion is considered acceptable. It is used to calculate depth-of-fie MORE
Entertainment / Photography / Diffusion Condenser Enlarger: Enlarger that combines diffuse light with a condenser system, producing more contrast and sharper detail than a diffusion enlarger but less contrast than a condenser enlarger. MORE
Science / Chemistry / Enthalpy Of Fusion: The change in enthalpy when one mole of solid melts to form one mole of liquid. Enthalpies of fusion are always positive because melting involves overcoming some of the intermolecular attractions in t MORE