Send a comment on this item to LII: Send a comment on this item to LII staff, who on weekdays will usually reply within 24 hours. TCAEP.co.uk: Science, Maths, Astronomy This site features lists of numerical constants and equations used in science and mathematics. Also included are conversion calculators, a dictionary of scientific symbols, and astronomy facts and figures. Searchable and browsable. From the Institute of Physics, London. http://www.scenta.co.uk/tcaep/ Asterisk * indicates required field. Your Name Your Email Address * We will not sell or provide your email address to anyone else. Comment * Enter the verification code as it is shown in the box below. This helps prevent automated submissions. *