In my previous blog, Reading the tea leaves, I stated that: “it is impossible to divide an atom in two while maintaining a non-explosive environment”. John Michael Williams, Senior Adjunct Faculty at ...

I love thinking about things I can’t see with just my eyes. Like the atoms that make up everything. I asked my friend Fred Gittes how to figure out the number of atoms in a leaf. He’s a physicist at ...

Chris Jeynes works for the University of Surrey Ion Beam Centre which receives funding from the Engineering and Physical Sciences Research Council and others for ion implantation and ion beam analysis ...

The need for a physical constant quantifying a reference amount of substance is a manifestation of the atomic nature of matter. At the basis of the concept of a 'quantity constant' lies the law of ...

Having read your very interesting article on the problems of creating a standard kilogram, I was left with a sense of “What’s the problem?” (22 February, p 32). If we go back to the definition of a ...