http://science.howstuffworks.com/avogadros-number.htm http://science.howstuffworks.com/avogadros-number.htm http://science.howstuffworks.com/avogadros-number.htm http://science.howstuffworks.com/avogadros-number.htm http://science.howstuffworks.com/avogadros-number.htm http://science.howstuffworks.com/avogadros-number.htm