1 Physical changes only change the appearance of a substance, not its chemical composition. 2  Chemical changes cause a substance to change into an entirely substance with a new chemical formula.  Chemical changes are also known as chemical reactions.
hand drawn definition, hand drawn meaning | English dictionary. Search also in: Web News Encyclopedia Images. hand. n. 1. a the prehensile part of the body at the end of the arm, consisting of a thumb, four fingers, and a palm. b the bones of this part. Related adj â manual. 2 the corresponding or similar part in animals. 3 something resembling this in shape or function.
Graph drawing. Graph drawing is an area of mathematics and computer science combining methods from geometric graph theory and information visualization to derive two-dimensional depictions of graphs arising from applications such as social network analysis, cartography, linguistics, and bioinformatics. A drawing of a graph or network diagram is a pictorial representation of the vertices and edges of a graph. This drawing should not be confused with the graph itself: very different layouts can correspond to the same graph. In the abstract, all that matters is which pairs of vertices are connected by edges.