"Change any unit of measure to another of the same dimension, meters to yards, gallons to liters. Choose from a vast range of categories, Length, Volume, Weight, Speed, Fuel Economy, and many more. Try our Periodic Table of Elements or check the tables of Old English measures. In addition to the converters, there are many additional facilities including tables of US and UK capacities, tables of some older UK/Imperial measures for hay, butter and yarn, coal, flour and timber, and wool weights, book sizes and paper sizes. There is an interactive "Periodic Table of Elements" showing the name, atomic number (protons), neutrons, atomic weight, electron configuration, filling orbital and boiling and melting points of each element."