However, diffusion needs not always be along the concentration gradient. For example, in the. alloy systems that contain a miscibility gap, the free energy curve can have a negative curvature. at low temperature, as shown below in Case 2.
Spur Meaning and Definition. ( 1 n.) The track of an animal, as an otter; a spoor. ( 2 n.) A branch of a vein. ( 3 n.) A wall that crosses a part of a rampart and joins to an inner wall. ( 4 n.) A sparrow. ( 5 n.) One of the large or principal roots of a tree.
1. (Plants) any pyramidal coniferous tree of the N temperate genus Abies, having single needle-like leaves and erect cones: family Pinaceae. See also red fir, silver fir, balsam fir. 2. (Plants) any of various other trees of the family Pinaceae, such as the Douglas fir. 3. (Plants) the wood of any of these trees.